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Finding the Fourth Proportional to 124.61, 172.00 and 89.76

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Solution

The fourth proportional to 124.61, 172.00 and 89.76 is: 123.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.61 : 172.00 = 89.76 : x
  2. Step 2: Convert to fraction form
    124.61/172.00 = 89.76/x
  3. Step 3: Cross multiply
    124.61x = 172.00 × 89.76
  4. Step 4: Simplify right side
    124.61x = 15,438.26
  5. Step 5: Solve for x
    x = 15,438.26/124.61
  6. Step 6: Final answer
    x = 123.89

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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.