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Finding the Fourth Proportional to 140.79, 210.78 and 100.08

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Solution

The fourth proportional to 140.79, 210.78 and 100.08 is: 149.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    140.79 : 210.78 = 100.08 : x
  2. Step 2: Convert to fraction form
    140.79/210.78 = 100.08/x
  3. Step 3: Cross multiply
    140.79x = 210.78 × 100.08
  4. Step 4: Simplify right side
    140.79x = 21,094.86
  5. Step 5: Solve for x
    x = 21,094.86/140.79
  6. Step 6: Final answer
    x = 149.83

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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.