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Finding the Fourth Proportional to 60.86, 83.51 and 57.42

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Solution

The fourth proportional to 60.86, 83.51 and 57.42 is: 78.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.86 : 83.51 = 57.42 : x
  2. Step 2: Convert to fraction form
    60.86/83.51 = 57.42/x
  3. Step 3: Cross multiply
    60.86x = 83.51 × 57.42
  4. Step 4: Simplify right side
    60.86x = 4,795.29
  5. Step 5: Solve for x
    x = 4,795.29/60.86
  6. Step 6: Final answer
    x = 78.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.