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Finding the Fourth Proportional to 100.50, 149.80 and 99.48

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Solution

The fourth proportional to 100.50, 149.80 and 99.48 is: 148.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.50 : 149.80 = 99.48 : x
  2. Step 2: Convert to fraction form
    100.50/149.80 = 99.48/x
  3. Step 3: Cross multiply
    100.50x = 149.80 × 99.48
  4. Step 4: Simplify right side
    100.50x = 14,902.10
  5. Step 5: Solve for x
    x = 14,902.10/100.50
  6. Step 6: Final answer
    x = 148.28

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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.