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Finding the Fourth Proportional to 709,412.30, 979,009.78 and 387,143.21

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Solution

The fourth proportional to 709,412.30, 979,009.78 and 387,143.21 is: 534,268.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,412.30 : 979,009.78 = 387,143.21 : x
  2. Step 2: Convert to fraction form
    709,412.30/979,009.78 = 387,143.21/x
  3. Step 3: Cross multiply
    709,412.30x = 979,009.78 × 387,143.21
  4. Step 4: Simplify right side
    709,412.30x = 379,016,983,955.55
  5. Step 5: Solve for x
    x = 379,016,983,955.55/709,412.30
  6. Step 6: Final answer
    x = 534,268.98

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1.5x scale

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.