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Finding the Fourth Proportional to 56.43, 77.87 and 31.53

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Solution

The fourth proportional to 56.43, 77.87 and 31.53 is: 43.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.43 : 77.87 = 31.53 : x
  2. Step 2: Convert to fraction form
    56.43/77.87 = 31.53/x
  3. Step 3: Cross multiply
    56.43x = 77.87 × 31.53
  4. Step 4: Simplify right side
    56.43x = 2,455.30
  5. Step 5: Solve for x
    x = 2,455.30/56.43
  6. Step 6: Final answer
    x = 43.51

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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.