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Finding the Fourth Proportional to 56.48, 78.09 and 42.74

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Solution

The fourth proportional to 56.48, 78.09 and 42.74 is: 59.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.48 : 78.09 = 42.74 : x
  2. Step 2: Convert to fraction form
    56.48/78.09 = 42.74/x
  3. Step 3: Cross multiply
    56.48x = 78.09 × 42.74
  4. Step 4: Simplify right side
    56.48x = 3,337.57
  5. Step 5: Solve for x
    x = 3,337.57/56.48
  6. Step 6: Final answer
    x = 59.09

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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.