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Finding the Fourth Proportional to 74.90, 112.46 and 59.70

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Solution

The fourth proportional to 74.90, 112.46 and 59.70 is: 89.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    74.90 : 112.46 = 59.70 : x
  2. Step 2: Convert to fraction form
    74.90/112.46 = 59.70/x
  3. Step 3: Cross multiply
    74.90x = 112.46 × 59.70
  4. Step 4: Simplify right side
    74.90x = 6,713.86
  5. Step 5: Solve for x
    x = 6,713.86/74.90
  6. Step 6: Final answer
    x = 89.64

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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.