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Finding the Fourth Proportional to 124.47, 171.59 and 87.51

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Solution

The fourth proportional to 124.47, 171.59 and 87.51 is: 120.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.47 : 171.59 = 87.51 : x
  2. Step 2: Convert to fraction form
    124.47/171.59 = 87.51/x
  3. Step 3: Cross multiply
    124.47x = 171.59 × 87.51
  4. Step 4: Simplify right side
    124.47x = 15,015.40
  5. Step 5: Solve for x
    x = 15,015.40/124.47
  6. Step 6: Final answer
    x = 120.63

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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.