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Finding the Fourth Proportional to 98.40, 147.72 and 66.48

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Solution

The fourth proportional to 98.40, 147.72 and 66.48 is: 99.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.40 : 147.72 = 66.48 : x
  2. Step 2: Convert to fraction form
    98.40/147.72 = 66.48/x
  3. Step 3: Cross multiply
    98.40x = 147.72 × 66.48
  4. Step 4: Simplify right side
    98.40x = 9,820.43
  5. Step 5: Solve for x
    x = 9,820.43/98.40
  6. Step 6: Final answer
    x = 99.80

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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.