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Finding the Fourth Proportional to 130.77, 180.48 and 81.63

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Solution

The fourth proportional to 130.77, 180.48 and 81.63 is: 112.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    130.77 : 180.48 = 81.63 : x
  2. Step 2: Convert to fraction form
    130.77/180.48 = 81.63/x
  3. Step 3: Cross multiply
    130.77x = 180.48 × 81.63
  4. Step 4: Simplify right side
    130.77x = 14,732.58
  5. Step 5: Solve for x
    x = 14,732.58/130.77
  6. Step 6: Final answer
    x = 112.66

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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.