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Finding the Fourth Proportional to 390,372.38, 538,685.60 and 215,935.21

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Solution

The fourth proportional to 390,372.38, 538,685.60 and 215,935.21 is: 297,974.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,372.38 : 538,685.60 = 215,935.21 : x
  2. Step 2: Convert to fraction form
    390,372.38/538,685.60 = 215,935.21/x
  3. Step 3: Cross multiply
    390,372.38x = 538,685.60 × 215,935.21
  4. Step 4: Simplify right side
    390,372.38x = 116,321,186,845.92
  5. Step 5: Solve for x
    x = 116,321,186,845.92/390,372.38
  6. Step 6: Final answer
    x = 297,974.94

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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.