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Finding the Fourth Proportional to 113.61, 170.32 and 103.58

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Solution

The fourth proportional to 113.61, 170.32 and 103.58 is: 155.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    113.61 : 170.32 = 103.58 : x
  2. Step 2: Convert to fraction form
    113.61/170.32 = 103.58/x
  3. Step 3: Cross multiply
    113.61x = 170.32 × 103.58
  4. Step 4: Simplify right side
    113.61x = 17,641.75
  5. Step 5: Solve for x
    x = 17,641.75/113.61
  6. Step 6: Final answer
    x = 155.28

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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.