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Finding the Fourth Proportional to 130.66, 180.15 and 81.46

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Solution

The fourth proportional to 130.66, 180.15 and 81.46 is: 112.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.66 : 180.15 = 81.46 : x
  2. Step 2: Convert to fraction form
    130.66/180.15 = 81.46/x
  3. Step 3: Cross multiply
    130.66x = 180.15 × 81.46
  4. Step 4: Simplify right side
    130.66x = 14,675.02
  5. Step 5: Solve for x
    x = 14,675.02/130.66
  6. Step 6: Final answer
    x = 112.31

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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.