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Finding the Fourth Proportional to 149.13, 223.65 and 76.98

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Solution

The fourth proportional to 149.13, 223.65 and 76.98 is: 115.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.13 : 223.65 = 76.98 : x
  2. Step 2: Convert to fraction form
    149.13/223.65 = 76.98/x
  3. Step 3: Cross multiply
    149.13x = 223.65 × 76.98
  4. Step 4: Simplify right side
    149.13x = 17,216.58
  5. Step 5: Solve for x
    x = 17,216.58/149.13
  6. Step 6: Final answer
    x = 115.45

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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.