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Finding the Fourth Proportional to 85,963.20, 128,944.80 and 81,042.45

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Solution

The fourth proportional to 85,963.20, 128,944.80 and 81,042.45 is: 121,563.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,963.20 : 128,944.80 = 81,042.45 : x
  2. Step 2: Convert to fraction form
    85,963.20/128,944.80 = 81,042.45/x
  3. Step 3: Cross multiply
    85,963.20x = 128,944.80 × 81,042.45
  4. Step 4: Simplify right side
    85,963.20x = 10,450,002,506.76
  5. Step 5: Solve for x
    x = 10,450,002,506.76/85,963.20
  6. Step 6: Final answer
    x = 121,563.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.