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Finding the Fourth Proportional to 91.93, 137.70 and 57.70

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Solution

The fourth proportional to 91.93, 137.70 and 57.70 is: 86.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.93 : 137.70 = 57.70 : x
  2. Step 2: Convert to fraction form
    91.93/137.70 = 57.70/x
  3. Step 3: Cross multiply
    91.93x = 137.70 × 57.70
  4. Step 4: Simplify right side
    91.93x = 7,945.29
  5. Step 5: Solve for x
    x = 7,945.29/91.93
  6. Step 6: Final answer
    x = 86.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.