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Finding the Fourth Proportional to 1,252,520,862.32, 1,728,375,881.42 and 687,976,568.51

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Solution

The fourth proportional to 1,252,520,862.32, 1,728,375,881.42 and 687,976,568.51 is: 949,351,139.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252,520,862.32 : 1,728,375,881.42 = 687,976,568.51 : x
  2. Step 2: Convert to fraction form
    1,252,520,862.32/1,728,375,881.42 = 687,976,568.51/x
  3. Step 3: Cross multiply
    1,252,520,862.32x = 1,728,375,881.42 × 687,976,568.51
  4. Step 4: Simplify right side
    1,252,520,862.32x = 1,189,082,107,982,696,448
  5. Step 5: Solve for x
    x = 1,189,082,107,982,696,448/1,252,520,862.32
  6. Step 6: Final answer
    x = 949,351,139.58

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Double scale
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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.