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Finding the Fourth Proportional to 124.64, 172.14 and 102.86

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Solution

The fourth proportional to 124.64, 172.14 and 102.86 is: 142.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    124.64 : 172.14 = 102.86 : x
  2. Step 2: Convert to fraction form
    124.64/172.14 = 102.86/x
  3. Step 3: Cross multiply
    124.64x = 172.14 × 102.86
  4. Step 4: Simplify right side
    124.64x = 17,706.32
  5. Step 5: Solve for x
    x = 17,706.32/124.64
  6. Step 6: Final answer
    x = 142.06

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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.