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Finding the Fourth Proportional to 66.02, 99.16 and 48.20

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Solution

The fourth proportional to 66.02, 99.16 and 48.20 is: 72.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.02 : 99.16 = 48.20 : x
  2. Step 2: Convert to fraction form
    66.02/99.16 = 48.20/x
  3. Step 3: Cross multiply
    66.02x = 99.16 × 48.20
  4. Step 4: Simplify right side
    66.02x = 4,778.90
  5. Step 5: Solve for x
    x = 4,778.90/66.02
  6. Step 6: Final answer
    x = 72.39

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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.