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Finding the Fourth Proportional to 113.18, 155.85 and 88.57

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Solution

The fourth proportional to 113.18, 155.85 and 88.57 is: 121.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.18 : 155.85 = 88.57 : x
  2. Step 2: Convert to fraction form
    113.18/155.85 = 88.57/x
  3. Step 3: Cross multiply
    113.18x = 155.85 × 88.57
  4. Step 4: Simplify right side
    113.18x = 13,802.86
  5. Step 5: Solve for x
    x = 13,802.86/113.18
  6. Step 6: Final answer
    x = 121.95

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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.