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Finding the Fourth Proportional to 61.44, 91.64 and 52.78

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Solution

The fourth proportional to 61.44, 91.64 and 52.78 is: 78.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.44 : 91.64 = 52.78 : x
  2. Step 2: Convert to fraction form
    61.44/91.64 = 52.78/x
  3. Step 3: Cross multiply
    61.44x = 91.64 × 52.78
  4. Step 4: Simplify right side
    61.44x = 4,836.76
  5. Step 5: Solve for x
    x = 4,836.76/61.44
  6. Step 6: Final answer
    x = 78.72

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.