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Finding the Fourth Proportional to 60.70, 91.43 and 57.86

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Solution

The fourth proportional to 60.70, 91.43 and 57.86 is: 87.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.70 : 91.43 = 57.86 : x
  2. Step 2: Convert to fraction form
    60.70/91.43 = 57.86/x
  3. Step 3: Cross multiply
    60.70x = 91.43 × 57.86
  4. Step 4: Simplify right side
    60.70x = 5,290.14
  5. Step 5: Solve for x
    x = 5,290.14/60.70
  6. Step 6: Final answer
    x = 87.15

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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.