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Finding the Fourth Proportional to 147.85, 203.95 and 98.66

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Solution

The fourth proportional to 147.85, 203.95 and 98.66 is: 136.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    147.85 : 203.95 = 98.66 : x
  2. Step 2: Convert to fraction form
    147.85/203.95 = 98.66/x
  3. Step 3: Cross multiply
    147.85x = 203.95 × 98.66
  4. Step 4: Simplify right side
    147.85x = 20,121.71
  5. Step 5: Solve for x
    x = 20,121.71/147.85
  6. Step 6: Final answer
    x = 136.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.