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Finding the Fourth Proportional to 71.88, 99.19 and 62.70

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Solution

The fourth proportional to 71.88, 99.19 and 62.70 is: 86.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.88 : 99.19 = 62.70 : x
  2. Step 2: Convert to fraction form
    71.88/99.19 = 62.70/x
  3. Step 3: Cross multiply
    71.88x = 99.19 × 62.70
  4. Step 4: Simplify right side
    71.88x = 6,219.21
  5. Step 5: Solve for x
    x = 6,219.21/71.88
  6. Step 6: Final answer
    x = 86.52

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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.