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Finding the Fourth Proportional to 130.68, 180 and 91.80

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Solution

The fourth proportional to 130.68, 180 and 91.80 is: 126.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.68 : 180 = 91.80 : x
  2. Step 2: Convert to fraction form
    130.68/180 = 91.80/x
  3. Step 3: Cross multiply
    130.68x = 180 × 91.80
  4. Step 4: Simplify right side
    130.68x = 16,524
  5. Step 5: Solve for x
    x = 16,524/130.68
  6. Step 6: Final answer
    x = 126.45

Related Problems

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Double scale
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1.5x scale

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.