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Finding the Fourth Proportional to 98.36, 147.20 and 71.18

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Solution

The fourth proportional to 98.36, 147.20 and 71.18 is: 106.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    98.36 : 147.20 = 71.18 : x
  2. Step 2: Convert to fraction form
    98.36/147.20 = 71.18/x
  3. Step 3: Cross multiply
    98.36x = 147.20 × 71.18
  4. Step 4: Simplify right side
    98.36x = 10,477.70
  5. Step 5: Solve for x
    x = 10,477.70/98.36
  6. Step 6: Final answer
    x = 106.52

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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.