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Finding the Fourth Proportional to 86.70, 119.67 and 57.60

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Solution

The fourth proportional to 86.70, 119.67 and 57.60 is: 79.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.70 : 119.67 = 57.60 : x
  2. Step 2: Convert to fraction form
    86.70/119.67 = 57.60/x
  3. Step 3: Cross multiply
    86.70x = 119.67 × 57.60
  4. Step 4: Simplify right side
    86.70x = 6,892.99
  5. Step 5: Solve for x
    x = 6,892.99/86.70
  6. Step 6: Final answer
    x = 79.50

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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.