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Finding the Fourth Proportional to 86.69, 129.93 and 59.60

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Solution

The fourth proportional to 86.69, 129.93 and 59.60 is: 89.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.69 : 129.93 = 59.60 : x
  2. Step 2: Convert to fraction form
    86.69/129.93 = 59.60/x
  3. Step 3: Cross multiply
    86.69x = 129.93 × 59.60
  4. Step 4: Simplify right side
    86.69x = 7,743.83
  5. Step 5: Solve for x
    x = 7,743.83/86.69
  6. Step 6: Final answer
    x = 89.33

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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.