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Finding the Fourth Proportional to 86.98, 129.93 and 74.08

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Solution

The fourth proportional to 86.98, 129.93 and 74.08 is: 110.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.98 : 129.93 = 74.08 : x
  2. Step 2: Convert to fraction form
    86.98/129.93 = 74.08/x
  3. Step 3: Cross multiply
    86.98x = 129.93 × 74.08
  4. Step 4: Simplify right side
    86.98x = 9,625.21
  5. Step 5: Solve for x
    x = 9,625.21/86.98
  6. Step 6: Final answer
    x = 110.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.