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Finding the Fourth Proportional to 98.94, 147.84 and 72.80

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Solution

The fourth proportional to 98.94, 147.84 and 72.80 is: 108.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.94 : 147.84 = 72.80 : x
  2. Step 2: Convert to fraction form
    98.94/147.84 = 72.80/x
  3. Step 3: Cross multiply
    98.94x = 147.84 × 72.80
  4. Step 4: Simplify right side
    98.94x = 10,762.52
  5. Step 5: Solve for x
    x = 10,762.52/98.94
  6. Step 6: Final answer
    x = 108.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.