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Finding the Fourth Proportional to 56.32, 84.48 and 42.87

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Solution

The fourth proportional to 56.32, 84.48 and 42.87 is: 64.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.32 : 84.48 = 42.87 : x
  2. Step 2: Convert to fraction form
    56.32/84.48 = 42.87/x
  3. Step 3: Cross multiply
    56.32x = 84.48 × 42.87
  4. Step 4: Simplify right side
    56.32x = 3,621.66
  5. Step 5: Solve for x
    x = 3,621.66/56.32
  6. Step 6: Final answer
    x = 64.31

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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.