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Finding the Fourth Proportional to 387,355, 581,054.36 and 138,037

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Solution

The fourth proportional to 387,355, 581,054.36 and 138,037 is: 207,063.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,355 : 581,054.36 = 138,037 : x
  2. Step 2: Convert to fraction form
    387,355/581,054.36 = 138,037/x
  3. Step 3: Cross multiply
    387,355x = 581,054.36 × 138,037
  4. Step 4: Simplify right side
    387,355x = 80,207,000,691.32
  5. Step 5: Solve for x
    x = 80,207,000,691.32/387,355
  6. Step 6: Final answer
    x = 207,063.29

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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.