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Finding the Fourth Proportional to 86.56, 119.40 and 53.80

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Solution

The fourth proportional to 86.56, 119.40 and 53.80 is: 74.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.56 : 119.40 = 53.80 : x
  2. Step 2: Convert to fraction form
    86.56/119.40 = 53.80/x
  3. Step 3: Cross multiply
    86.56x = 119.40 × 53.80
  4. Step 4: Simplify right side
    86.56x = 6,423.72
  5. Step 5: Solve for x
    x = 6,423.72/86.56
  6. Step 6: Final answer
    x = 74.21

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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.