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Finding the Fourth Proportional to 52.81, 72.75 and 42.43

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Solution

The fourth proportional to 52.81, 72.75 and 42.43 is: 58.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.81 : 72.75 = 42.43 : x
  2. Step 2: Convert to fraction form
    52.81/72.75 = 42.43/x
  3. Step 3: Cross multiply
    52.81x = 72.75 × 42.43
  4. Step 4: Simplify right side
    52.81x = 3,086.78
  5. Step 5: Solve for x
    x = 3,086.78/52.81
  6. Step 6: Final answer
    x = 58.45

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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.