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Finding the Fourth Proportional to 103.04, 142.15 and 61.57

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Solution

The fourth proportional to 103.04, 142.15 and 61.57 is: 84.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    103.04 : 142.15 = 61.57 : x
  2. Step 2: Convert to fraction form
    103.04/142.15 = 61.57/x
  3. Step 3: Cross multiply
    103.04x = 142.15 × 61.57
  4. Step 4: Simplify right side
    103.04x = 8,751.87
  5. Step 5: Solve for x
    x = 8,751.87/103.04
  6. Step 6: Final answer
    x = 84.94

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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.