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Finding the Fourth Proportional to 130.80, 180.47 and 91.40

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Solution

The fourth proportional to 130.80, 180.47 and 91.40 is: 126.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.80 : 180.47 = 91.40 : x
  2. Step 2: Convert to fraction form
    130.80/180.47 = 91.40/x
  3. Step 3: Cross multiply
    130.80x = 180.47 × 91.40
  4. Step 4: Simplify right side
    130.80x = 16,494.28
  5. Step 5: Solve for x
    x = 16,494.28/130.80
  6. Step 6: Final answer
    x = 126.10

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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.