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Finding the Fourth Proportional to 84.48, 116.61 and 51.72

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Solution

The fourth proportional to 84.48, 116.61 and 51.72 is: 71.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.48 : 116.61 = 51.72 : x
  2. Step 2: Convert to fraction form
    84.48/116.61 = 51.72/x
  3. Step 3: Cross multiply
    84.48x = 116.61 × 51.72
  4. Step 4: Simplify right side
    84.48x = 6,031.07
  5. Step 5: Solve for x
    x = 6,031.07/84.48
  6. Step 6: Final answer
    x = 71.39

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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.