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Finding the Fourth Proportional to 74.53, 102.64 and 61.46

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Solution

The fourth proportional to 74.53, 102.64 and 61.46 is: 84.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.53 : 102.64 = 61.46 : x
  2. Step 2: Convert to fraction form
    74.53/102.64 = 61.46/x
  3. Step 3: Cross multiply
    74.53x = 102.64 × 61.46
  4. Step 4: Simplify right side
    74.53x = 6,308.25
  5. Step 5: Solve for x
    x = 6,308.25/74.53
  6. Step 6: Final answer
    x = 84.64

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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.