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Finding the Fourth Proportional to 85,947.52, 128,800.32 and 68,339.20

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Solution

The fourth proportional to 85,947.52, 128,800.32 and 68,339.20 is: 102,412.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,947.52 : 128,800.32 = 68,339.20 : x
  2. Step 2: Convert to fraction form
    85,947.52/128,800.32 = 68,339.20/x
  3. Step 3: Cross multiply
    85,947.52x = 128,800.32 × 68,339.20
  4. Step 4: Simplify right side
    85,947.52x = 8,802,110,828.54
  5. Step 5: Solve for x
    x = 8,802,110,828.54/85,947.52
  6. Step 6: Final answer
    x = 102,412.62

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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.