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Finding the Fourth Proportional to 52.79, 79.16 and 28.45

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Solution

The fourth proportional to 52.79, 79.16 and 28.45 is: 42.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.79 : 79.16 = 28.45 : x
  2. Step 2: Convert to fraction form
    52.79/79.16 = 28.45/x
  3. Step 3: Cross multiply
    52.79x = 79.16 × 28.45
  4. Step 4: Simplify right side
    52.79x = 2,251.87
  5. Step 5: Solve for x
    x = 2,251.87/52.79
  6. Step 6: Final answer
    x = 42.66

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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.