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Finding the Fourth Proportional to 124.04, 171.24 and 85.40

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Solution

The fourth proportional to 124.04, 171.24 and 85.40 is: 117.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.04 : 171.24 = 85.40 : x
  2. Step 2: Convert to fraction form
    124.04/171.24 = 85.40/x
  3. Step 3: Cross multiply
    124.04x = 171.24 × 85.40
  4. Step 4: Simplify right side
    124.04x = 14,623.90
  5. Step 5: Solve for x
    x = 14,623.90/124.04
  6. Step 6: Final answer
    x = 117.90

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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.