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Finding the Fourth Proportional to 527.72, 727.71 and 317.85

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Solution

The fourth proportional to 527.72, 727.71 and 317.85 is: 438.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.72 : 727.71 = 317.85 : x
  2. Step 2: Convert to fraction form
    527.72/727.71 = 317.85/x
  3. Step 3: Cross multiply
    527.72x = 727.71 × 317.85
  4. Step 4: Simplify right side
    527.72x = 231,301.64
  5. Step 5: Solve for x
    x = 231,301.64/527.72
  6. Step 6: Final answer
    x = 438.31

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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.