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Finding the Fourth Proportional to 62.76, 87.21 and 62.00

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Solution

The fourth proportional to 62.76, 87.21 and 62.00 is: 86.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    62.76 : 87.21 = 62.00 : x
  2. Step 2: Convert to fraction form
    62.76/87.21 = 62.00/x
  3. Step 3: Cross multiply
    62.76x = 87.21 × 62.00
  4. Step 4: Simplify right side
    62.76x = 5,406.58
  5. Step 5: Solve for x
    x = 5,406.58/62.76
  6. Step 6: Final answer
    x = 86.15

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.