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Finding the Fourth Proportional to 85,805.40, 128,712.99 and 28,856.44

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Solution

The fourth proportional to 85,805.40, 128,712.99 and 28,856.44 is: 43,286.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,805.40 : 128,712.99 = 28,856.44 : x
  2. Step 2: Convert to fraction form
    85,805.40/128,712.99 = 28,856.44/x
  3. Step 3: Cross multiply
    85,805.40x = 128,712.99 × 28,856.44
  4. Step 4: Simplify right side
    85,805.40x = 3,714,198,673.16
  5. Step 5: Solve for x
    x = 3,714,198,673.16/85,805.40
  6. Step 6: Final answer
    x = 43,286.30

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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.