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Finding the Fourth Proportional to 130.58, 180.11 and 91.25

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Solution

The fourth proportional to 130.58, 180.11 and 91.25 is: 125.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.58 : 180.11 = 91.25 : x
  2. Step 2: Convert to fraction form
    130.58/180.11 = 91.25/x
  3. Step 3: Cross multiply
    130.58x = 180.11 × 91.25
  4. Step 4: Simplify right side
    130.58x = 16,435.04
  5. Step 5: Solve for x
    x = 16,435.04/130.58
  6. Step 6: Final answer
    x = 125.86

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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.