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Finding the Fourth Proportional to 124.61, 172.80 and 112.46

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Solution

The fourth proportional to 124.61, 172.80 and 112.46 is: 155.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.61 : 172.80 = 112.46 : x
  2. Step 2: Convert to fraction form
    124.61/172.80 = 112.46/x
  3. Step 3: Cross multiply
    124.61x = 172.80 × 112.46
  4. Step 4: Simplify right side
    124.61x = 19,432.22
  5. Step 5: Solve for x
    x = 19,432.22/124.61
  6. Step 6: Final answer
    x = 155.95

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.