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Finding the Fourth Proportional to 91.40, 136.80 and 57.03

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Solution

The fourth proportional to 91.40, 136.80 and 57.03 is: 85.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.40 : 136.80 = 57.03 : x
  2. Step 2: Convert to fraction form
    91.40/136.80 = 57.03/x
  3. Step 3: Cross multiply
    91.40x = 136.80 × 57.03
  4. Step 4: Simplify right side
    91.40x = 7,801.70
  5. Step 5: Solve for x
    x = 7,801.70/91.40
  6. Step 6: Final answer
    x = 85.36

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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.