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Finding the Fourth Proportional to 98.40, 147.65 and 52.79

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Solution

The fourth proportional to 98.40, 147.65 and 52.79 is: 79.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.40 : 147.65 = 52.79 : x
  2. Step 2: Convert to fraction form
    98.40/147.65 = 52.79/x
  3. Step 3: Cross multiply
    98.40x = 147.65 × 52.79
  4. Step 4: Simplify right side
    98.40x = 7,793.99
  5. Step 5: Solve for x
    x = 7,793.99/98.40
  6. Step 6: Final answer
    x = 79.21

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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.