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Finding the Fourth Proportional to 56.76, 78.33 and 42.87

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Solution

The fourth proportional to 56.76, 78.33 and 42.87 is: 59.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.76 : 78.33 = 42.87 : x
  2. Step 2: Convert to fraction form
    56.76/78.33 = 42.87/x
  3. Step 3: Cross multiply
    56.76x = 78.33 × 42.87
  4. Step 4: Simplify right side
    56.76x = 3,358.01
  5. Step 5: Solve for x
    x = 3,358.01/56.76
  6. Step 6: Final answer
    x = 59.16

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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.