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Finding the Fourth Proportional to 86.61, 119.36 and 65.83

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Solution

The fourth proportional to 86.61, 119.36 and 65.83 is: 90.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.61 : 119.36 = 65.83 : x
  2. Step 2: Convert to fraction form
    86.61/119.36 = 65.83/x
  3. Step 3: Cross multiply
    86.61x = 119.36 × 65.83
  4. Step 4: Simplify right side
    86.61x = 7,857.47
  5. Step 5: Solve for x
    x = 7,857.47/86.61
  6. Step 6: Final answer
    x = 90.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.