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Finding the Fourth Proportional to 527.80, 728.31 and 291.74

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Solution

The fourth proportional to 527.80, 728.31 and 291.74 is: 402.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.80 : 728.31 = 291.74 : x
  2. Step 2: Convert to fraction form
    527.80/728.31 = 291.74/x
  3. Step 3: Cross multiply
    527.80x = 728.31 × 291.74
  4. Step 4: Simplify right side
    527.80x = 212,477.16
  5. Step 5: Solve for x
    x = 212,477.16/527.80
  6. Step 6: Final answer
    x = 402.57

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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.