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Finding the Fourth Proportional to 100.90, 151.38 and 43.09

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Solution

The fourth proportional to 100.90, 151.38 and 43.09 is: 64.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    100.90 : 151.38 = 43.09 : x
  2. Step 2: Convert to fraction form
    100.90/151.38 = 43.09/x
  3. Step 3: Cross multiply
    100.90x = 151.38 × 43.09
  4. Step 4: Simplify right side
    100.90x = 6,522.96
  5. Step 5: Solve for x
    x = 6,522.96/100.90
  6. Step 6: Final answer
    x = 64.65

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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.