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Finding the Fourth Proportional to 91.19, 126.71 and 90.25

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Solution

The fourth proportional to 91.19, 126.71 and 90.25 is: 125.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.19 : 126.71 = 90.25 : x
  2. Step 2: Convert to fraction form
    91.19/126.71 = 90.25/x
  3. Step 3: Cross multiply
    91.19x = 126.71 × 90.25
  4. Step 4: Simplify right side
    91.19x = 11,435.66
  5. Step 5: Solve for x
    x = 11,435.66/91.19
  6. Step 6: Final answer
    x = 125.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.