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Finding the Fourth Proportional to 390,335.31, 538,655.72 and 220,565.79

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Solution

The fourth proportional to 390,335.31, 538,655.72 and 220,565.79 is: 304,376.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,335.31 : 538,655.72 = 220,565.79 : x
  2. Step 2: Convert to fraction form
    390,335.31/538,655.72 = 220,565.79/x
  3. Step 3: Cross multiply
    390,335.31x = 538,655.72 × 220,565.79
  4. Step 4: Simplify right side
    390,335.31x = 118,809,024,419.82
  5. Step 5: Solve for x
    x = 118,809,024,419.82/390,335.31
  6. Step 6: Final answer
    x = 304,376.83

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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.