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Finding the Fourth Proportional to 140.90, 211.01 and 99.72

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Solution

The fourth proportional to 140.90, 211.01 and 99.72 is: 149.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.90 : 211.01 = 99.72 : x
  2. Step 2: Convert to fraction form
    140.90/211.01 = 99.72/x
  3. Step 3: Cross multiply
    140.90x = 211.01 × 99.72
  4. Step 4: Simplify right side
    140.90x = 21,041.42
  5. Step 5: Solve for x
    x = 21,041.42/140.90
  6. Step 6: Final answer
    x = 149.34

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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.