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Finding the Fourth Proportional to 85,382.85, 128,074.28 and 54,355.65

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Solution

The fourth proportional to 85,382.85, 128,074.28 and 54,355.65 is: 81,533.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,382.85 : 128,074.28 = 54,355.65 : x
  2. Step 2: Convert to fraction form
    85,382.85/128,074.28 = 54,355.65/x
  3. Step 3: Cross multiply
    85,382.85x = 128,074.28 × 54,355.65
  4. Step 4: Simplify right side
    85,382.85x = 6,961,560,465.90
  5. Step 5: Solve for x
    x = 6,961,560,465.90/85,382.85
  6. Step 6: Final answer
    x = 81,533.48

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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.