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Finding the Fourth Proportional to 149.10, 205.70 and 99.98

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Solution

The fourth proportional to 149.10, 205.70 and 99.98 is: 137.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.10 : 205.70 = 99.98 : x
  2. Step 2: Convert to fraction form
    149.10/205.70 = 99.98/x
  3. Step 3: Cross multiply
    149.10x = 205.70 × 99.98
  4. Step 4: Simplify right side
    149.10x = 20,565.90
  5. Step 5: Solve for x
    x = 20,565.90/149.10
  6. Step 6: Final answer
    x = 137.93

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.