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Finding the Fourth Proportional to 74.68, 111.80 and 61.72

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Solution

The fourth proportional to 74.68, 111.80 and 61.72 is: 92.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.68 : 111.80 = 61.72 : x
  2. Step 2: Convert to fraction form
    74.68/111.80 = 61.72/x
  3. Step 3: Cross multiply
    74.68x = 111.80 × 61.72
  4. Step 4: Simplify right side
    74.68x = 6,900.30
  5. Step 5: Solve for x
    x = 6,900.30/74.68
  6. Step 6: Final answer
    x = 92.40

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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.