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Finding the Fourth Proportional to 387,388.17, 534,591.90 and 215,306.51

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Solution

The fourth proportional to 387,388.17, 534,591.90 and 215,306.51 is: 297,120.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,388.17 : 534,591.90 = 215,306.51 : x
  2. Step 2: Convert to fraction form
    387,388.17/534,591.90 = 215,306.51/x
  3. Step 3: Cross multiply
    387,388.17x = 534,591.90 × 215,306.51
  4. Step 4: Simplify right side
    387,388.17x = 115,101,113,590.31
  5. Step 5: Solve for x
    x = 115,101,113,590.31/387,388.17
  6. Step 6: Final answer
    x = 297,120.88

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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.