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Finding the Fourth Proportional to 56.98, 86.13 and 56.38

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Solution

The fourth proportional to 56.98, 86.13 and 56.38 is: 85.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.98 : 86.13 = 56.38 : x
  2. Step 2: Convert to fraction form
    56.98/86.13 = 56.38/x
  3. Step 3: Cross multiply
    56.98x = 86.13 × 56.38
  4. Step 4: Simplify right side
    56.98x = 4,856.01
  5. Step 5: Solve for x
    x = 4,856.01/56.98
  6. Step 6: Final answer
    x = 85.22

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.