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Finding the Fourth Proportional to 86.86, 130.39 and 74.10

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Solution

The fourth proportional to 86.86, 130.39 and 74.10 is: 111.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.86 : 130.39 = 74.10 : x
  2. Step 2: Convert to fraction form
    86.86/130.39 = 74.10/x
  3. Step 3: Cross multiply
    86.86x = 130.39 × 74.10
  4. Step 4: Simplify right side
    86.86x = 9,661.89
  5. Step 5: Solve for x
    x = 9,661.89/86.86
  6. Step 6: Final answer
    x = 111.24

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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.