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Finding the Fourth Proportional to 85,963.10, 128,944.65 and 78,575.90

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Solution

The fourth proportional to 85,963.10, 128,944.65 and 78,575.90 is: 117,863.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,963.10 : 128,944.65 = 78,575.90 : x
  2. Step 2: Convert to fraction form
    85,963.10/128,944.65 = 78,575.90/x
  3. Step 3: Cross multiply
    85,963.10x = 128,944.65 × 78,575.90
  4. Step 4: Simplify right side
    85,963.10x = 10,131,941,923.94
  5. Step 5: Solve for x
    x = 10,131,941,923.94/85,963.10
  6. Step 6: Final answer
    x = 117,863.85

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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.