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Finding the Fourth Proportional to 85,751.79, 128,694.83 and 56,161.95

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Solution

The fourth proportional to 85,751.79, 128,694.83 and 56,161.95 is: 84,286.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,751.79 : 128,694.83 = 56,161.95 : x
  2. Step 2: Convert to fraction form
    85,751.79/128,694.83 = 56,161.95/x
  3. Step 3: Cross multiply
    85,751.79x = 128,694.83 × 56,161.95
  4. Step 4: Simplify right side
    85,751.79x = 7,227,752,326.91
  5. Step 5: Solve for x
    x = 7,227,752,326.91/85,751.79
  6. Step 6: Final answer
    x = 84,286.90

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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.