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Finding the Fourth Proportional to 85,816.80, 128,725.20 and 81,005.40

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Solution

The fourth proportional to 85,816.80, 128,725.20 and 81,005.40 is: 121,508.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,816.80 : 128,725.20 = 81,005.40 : x
  2. Step 2: Convert to fraction form
    85,816.80/128,725.20 = 81,005.40/x
  3. Step 3: Cross multiply
    85,816.80x = 128,725.20 × 81,005.40
  4. Step 4: Simplify right side
    85,816.80x = 10,427,436,316.08
  5. Step 5: Solve for x
    x = 10,427,436,316.08/85,816.80
  6. Step 6: Final answer
    x = 121,508.10

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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.