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Finding the Fourth Proportional to 61.80, 92.76 and 53.28

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Solution

The fourth proportional to 61.80, 92.76 and 53.28 is: 79.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.80 : 92.76 = 53.28 : x
  2. Step 2: Convert to fraction form
    61.80/92.76 = 53.28/x
  3. Step 3: Cross multiply
    61.80x = 92.76 × 53.28
  4. Step 4: Simplify right side
    61.80x = 4,942.25
  5. Step 5: Solve for x
    x = 4,942.25/61.80
  6. Step 6: Final answer
    x = 79.97

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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.