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Finding the Fourth Proportional to 390,426.72, 538,785.11 and 218,342.78

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Solution

The fourth proportional to 390,426.72, 538,785.11 and 218,342.78 is: 301,310.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,426.72 : 538,785.11 = 218,342.78 : x
  2. Step 2: Convert to fraction form
    390,426.72/538,785.11 = 218,342.78/x
  3. Step 3: Cross multiply
    390,426.72x = 538,785.11 × 218,342.78
  4. Step 4: Simplify right side
    390,426.72x = 117,639,834,954.37
  5. Step 5: Solve for x
    x = 117,639,834,954.37/390,426.72
  6. Step 6: Final answer
    x = 301,310.92

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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.