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Finding the Fourth Proportional to 74.64, 102.87 and 61.47

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Solution

The fourth proportional to 74.64, 102.87 and 61.47 is: 84.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.64 : 102.87 = 61.47 : x
  2. Step 2: Convert to fraction form
    74.64/102.87 = 61.47/x
  3. Step 3: Cross multiply
    74.64x = 102.87 × 61.47
  4. Step 4: Simplify right side
    74.64x = 6,323.42
  5. Step 5: Solve for x
    x = 6,323.42/74.64
  6. Step 6: Final answer
    x = 84.72

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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.