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Finding the Fourth Proportional to 113.90, 170.98 and 59.78

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Solution

The fourth proportional to 113.90, 170.98 and 59.78 is: 89.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.90 : 170.98 = 59.78 : x
  2. Step 2: Convert to fraction form
    113.90/170.98 = 59.78/x
  3. Step 3: Cross multiply
    113.90x = 170.98 × 59.78
  4. Step 4: Simplify right side
    113.90x = 10,221.18
  5. Step 5: Solve for x
    x = 10,221.18/113.90
  6. Step 6: Final answer
    x = 89.74

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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.