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Finding the Fourth Proportional to 527.40, 791.10 and 487.80

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Solution

The fourth proportional to 527.40, 791.10 and 487.80 is: 731.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.40 : 791.10 = 487.80 : x
  2. Step 2: Convert to fraction form
    527.40/791.10 = 487.80/x
  3. Step 3: Cross multiply
    527.40x = 791.10 × 487.80
  4. Step 4: Simplify right side
    527.40x = 385,898.58
  5. Step 5: Solve for x
    x = 385,898.58/527.40
  6. Step 6: Final answer
    x = 731.70

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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.