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Finding the Fourth Proportional to 58.31, 86.86 and 57.60

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Solution

The fourth proportional to 58.31, 86.86 and 57.60 is: 85.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    58.31 : 86.86 = 57.60 : x
  2. Step 2: Convert to fraction form
    58.31/86.86 = 57.60/x
  3. Step 3: Cross multiply
    58.31x = 86.86 × 57.60
  4. Step 4: Simplify right side
    58.31x = 5,002.85
  5. Step 5: Solve for x
    x = 5,002.85/58.31
  6. Step 6: Final answer
    x = 85.80

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.