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Finding the Fourth Proportional to 52.79, 72.78 and 45.43

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Solution

The fourth proportional to 52.79, 72.78 and 45.43 is: 62.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.79 : 72.78 = 45.43 : x
  2. Step 2: Convert to fraction form
    52.79/72.78 = 45.43/x
  3. Step 3: Cross multiply
    52.79x = 72.78 × 45.43
  4. Step 4: Simplify right side
    52.79x = 3,306.49
  5. Step 5: Solve for x
    x = 3,306.49/52.79
  6. Step 6: Final answer
    x = 62.64

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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.