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Finding the Fourth Proportional to 709,401.68, 978,995.09 and 387,132.54

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Solution

The fourth proportional to 709,401.68, 978,995.09 and 387,132.54 is: 534,254.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,401.68 : 978,995.09 = 387,132.54 : x
  2. Step 2: Convert to fraction form
    709,401.68/978,995.09 = 387,132.54/x
  3. Step 3: Cross multiply
    709,401.68x = 978,995.09 × 387,132.54
  4. Step 4: Simplify right side
    709,401.68x = 379,000,853,903.57
  5. Step 5: Solve for x
    x = 379,000,853,903.57/709,401.68
  6. Step 6: Final answer
    x = 534,254.24

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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.