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Finding the Fourth Proportional to 527,648.78, 791,473.20 and 128,286.90

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Solution

The fourth proportional to 527,648.78, 791,473.20 and 128,286.90 is: 192,430.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    527,648.78 : 791,473.20 = 128,286.90 : x
  2. Step 2: Convert to fraction form
    527,648.78/791,473.20 = 128,286.90/x
  3. Step 3: Cross multiply
    527,648.78x = 791,473.20 × 128,286.90
  4. Step 4: Simplify right side
    527,648.78x = 101,535,643,261.08
  5. Step 5: Solve for x
    x = 101,535,643,261.08/527,648.78
  6. Step 6: Final answer
    x = 192,430.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.