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Finding the Fourth Proportional to 98.71, 147.80 and 72.96

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Solution

The fourth proportional to 98.71, 147.80 and 72.96 is: 109.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.71 : 147.80 = 72.96 : x
  2. Step 2: Convert to fraction form
    98.71/147.80 = 72.96/x
  3. Step 3: Cross multiply
    98.71x = 147.80 × 72.96
  4. Step 4: Simplify right side
    98.71x = 10,783.49
  5. Step 5: Solve for x
    x = 10,783.49/98.71
  6. Step 6: Final answer
    x = 109.24

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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.