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Finding the Fourth Proportional to 390,251.37, 585,110.68 and 207,909.43

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Solution

The fourth proportional to 390,251.37, 585,110.68 and 207,909.43 is: 311,722.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,251.37 : 585,110.68 = 207,909.43 : x
  2. Step 2: Convert to fraction form
    390,251.37/585,110.68 = 207,909.43/x
  3. Step 3: Cross multiply
    390,251.37x = 585,110.68 × 207,909.43
  4. Step 4: Simplify right side
    390,251.37x = 121,650,027,965.71
  5. Step 5: Solve for x
    x = 121,650,027,965.71/390,251.37
  6. Step 6: Final answer
    x = 311,722.23

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.