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Finding the Fourth Proportional to 103.46, 142.86 and 72.40

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Solution

The fourth proportional to 103.46, 142.86 and 72.40 is: 99.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.46 : 142.86 = 72.40 : x
  2. Step 2: Convert to fraction form
    103.46/142.86 = 72.40/x
  3. Step 3: Cross multiply
    103.46x = 142.86 × 72.40
  4. Step 4: Simplify right side
    103.46x = 10,343.06
  5. Step 5: Solve for x
    x = 10,343.06/103.46
  6. Step 6: Final answer
    x = 99.97

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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.