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Finding the Fourth Proportional to 86.13, 129.11 and 45.01

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Solution

The fourth proportional to 86.13, 129.11 and 45.01 is: 67.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.13 : 129.11 = 45.01 : x
  2. Step 2: Convert to fraction form
    86.13/129.11 = 45.01/x
  3. Step 3: Cross multiply
    86.13x = 129.11 × 45.01
  4. Step 4: Simplify right side
    86.13x = 5,811.10
  5. Step 5: Solve for x
    x = 5,811.10/86.13
  6. Step 6: Final answer
    x = 67.47

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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.