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Finding the Fourth Proportional to 85,793.49, 128,689.83 and 21,751.65

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Solution

The fourth proportional to 85,793.49, 128,689.83 and 21,751.65 is: 32,627.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,793.49 : 128,689.83 = 21,751.65 : x
  2. Step 2: Convert to fraction form
    85,793.49/128,689.83 = 21,751.65/x
  3. Step 3: Cross multiply
    85,793.49x = 128,689.83 × 21,751.65
  4. Step 4: Simplify right side
    85,793.49x = 2,799,216,140.72
  5. Step 5: Solve for x
    x = 2,799,216,140.72/85,793.49
  6. Step 6: Final answer
    x = 32,627.37

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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.