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Finding the Fourth Proportional to 100.83, 151 and 99.15

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Solution

The fourth proportional to 100.83, 151 and 99.15 is: 148.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.83 : 151 = 99.15 : x
  2. Step 2: Convert to fraction form
    100.83/151 = 99.15/x
  3. Step 3: Cross multiply
    100.83x = 151 × 99.15
  4. Step 4: Simplify right side
    100.83x = 14,971.65
  5. Step 5: Solve for x
    x = 14,971.65/100.83
  6. Step 6: Final answer
    x = 148.48

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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.