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Finding the Fourth Proportional to 86.85, 119.85 and 52.35

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Solution

The fourth proportional to 86.85, 119.85 and 52.35 is: 72.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.85 : 119.85 = 52.35 : x
  2. Step 2: Convert to fraction form
    86.85/119.85 = 52.35/x
  3. Step 3: Cross multiply
    86.85x = 119.85 × 52.35
  4. Step 4: Simplify right side
    86.85x = 6,273.29
  5. Step 5: Solve for x
    x = 6,273.29/86.85
  6. Step 6: Final answer
    x = 72.24

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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.