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Finding the Fourth Proportional to 527.76, 728.24 and 317.90

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Solution

The fourth proportional to 527.76, 728.24 and 317.90 is: 438.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.76 : 728.24 = 317.90 : x
  2. Step 2: Convert to fraction form
    527.76/728.24 = 317.90/x
  3. Step 3: Cross multiply
    527.76x = 728.24 × 317.90
  4. Step 4: Simplify right side
    527.76x = 231,507.73
  5. Step 5: Solve for x
    x = 231,507.73/527.76
  6. Step 6: Final answer
    x = 438.66

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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.