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Finding the Fourth Proportional to 312,781.30, 431,639.10 and 169,541.92

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Solution

The fourth proportional to 312,781.30, 431,639.10 and 169,541.92 is: 233,968.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,781.30 : 431,639.10 = 169,541.92 : x
  2. Step 2: Convert to fraction form
    312,781.30/431,639.10 = 169,541.92/x
  3. Step 3: Cross multiply
    312,781.30x = 431,639.10 × 169,541.92
  4. Step 4: Simplify right side
    312,781.30x = 73,180,921,761.07
  5. Step 5: Solve for x
    x = 73,180,921,761.07/312,781.30
  6. Step 6: Final answer
    x = 233,968.34

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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.