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Finding the Fourth Proportional to 84.47, 126.70 and 23.60

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Solution

The fourth proportional to 84.47, 126.70 and 23.60 is: 35.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.47 : 126.70 = 23.60 : x
  2. Step 2: Convert to fraction form
    84.47/126.70 = 23.60/x
  3. Step 3: Cross multiply
    84.47x = 126.70 × 23.60
  4. Step 4: Simplify right side
    84.47x = 2,990.38
  5. Step 5: Solve for x
    x = 2,990.38/84.47
  6. Step 6: Final answer
    x = 35.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.