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Finding the Fourth Proportional to 130.77, 180 and 115.27

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Solution

The fourth proportional to 130.77, 180 and 115.27 is: 158.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.77 : 180 = 115.27 : x
  2. Step 2: Convert to fraction form
    130.77/180 = 115.27/x
  3. Step 3: Cross multiply
    130.77x = 180 × 115.27
  4. Step 4: Simplify right side
    130.77x = 20,748.15
  5. Step 5: Solve for x
    x = 20,748.15/130.77
  6. Step 6: Final answer
    x = 158.66

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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.