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Finding the Fourth Proportional to 527.81, 728.32 and 291.74

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Solution

The fourth proportional to 527.81, 728.32 and 291.74 is: 402.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.81 : 728.32 = 291.74 : x
  2. Step 2: Convert to fraction form
    527.81/728.32 = 291.74/x
  3. Step 3: Cross multiply
    527.81x = 728.32 × 291.74
  4. Step 4: Simplify right side
    527.81x = 212,481.35
  5. Step 5: Solve for x
    x = 212,481.35/527.81
  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.