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Finding the Fourth Proportional to 148.07, 221.70 and 99.88

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Solution

The fourth proportional to 148.07, 221.70 and 99.88 is: 149.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.07 : 221.70 = 99.88 : x
  2. Step 2: Convert to fraction form
    148.07/221.70 = 99.88/x
  3. Step 3: Cross multiply
    148.07x = 221.70 × 99.88
  4. Step 4: Simplify right side
    148.07x = 22,143.40
  5. Step 5: Solve for x
    x = 22,143.40/148.07
  6. Step 6: Final answer
    x = 149.55

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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.