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Finding the Fourth Proportional to 91.21, 125.86 and 56.25

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Solution

The fourth proportional to 91.21, 125.86 and 56.25 is: 77.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.21 : 125.86 = 56.25 : x
  2. Step 2: Convert to fraction form
    91.21/125.86 = 56.25/x
  3. Step 3: Cross multiply
    91.21x = 125.86 × 56.25
  4. Step 4: Simplify right side
    91.21x = 7,078.71
  5. Step 5: Solve for x
    x = 7,078.71/91.21
  6. Step 6: Final answer
    x = 77.61

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.