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Finding the Fourth Proportional to 387,691.82, 535,017.66 and 215,612.18

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Solution

The fourth proportional to 387,691.82, 535,017.66 and 215,612.18 is: 297,546.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,691.82 : 535,017.66 = 215,612.18 : x
  2. Step 2: Convert to fraction form
    387,691.82/535,017.66 = 215,612.18/x
  3. Step 3: Cross multiply
    387,691.82x = 535,017.66 × 215,612.18
  4. Step 4: Simplify right side
    387,691.82x = 115,356,324,011.10
  5. Step 5: Solve for x
    x = 115,356,324,011.10/387,691.82
  6. Step 6: Final answer
    x = 297,546.45

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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.