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Finding the Fourth Proportional to 99.81, 149.57 and 70.98

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Solution

The fourth proportional to 99.81, 149.57 and 70.98 is: 106.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.81 : 149.57 = 70.98 : x
  2. Step 2: Convert to fraction form
    99.81/149.57 = 70.98/x
  3. Step 3: Cross multiply
    99.81x = 149.57 × 70.98
  4. Step 4: Simplify right side
    99.81x = 10,616.24
  5. Step 5: Solve for x
    x = 10,616.24/99.81
  6. Step 6: Final answer
    x = 106.36

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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.