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Finding the Fourth Proportional to 56.72, 85.12 and 31.08

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Solution

The fourth proportional to 56.72, 85.12 and 31.08 is: 46.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.72 : 85.12 = 31.08 : x
  2. Step 2: Convert to fraction form
    56.72/85.12 = 31.08/x
  3. Step 3: Cross multiply
    56.72x = 85.12 × 31.08
  4. Step 4: Simplify right side
    56.72x = 2,645.53
  5. Step 5: Solve for x
    x = 2,645.53/56.72
  6. Step 6: Final answer
    x = 46.64

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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.