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Finding the Fourth Proportional to 85,872.40, 128,808.60 and 81,498.40

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Solution

The fourth proportional to 85,872.40, 128,808.60 and 81,498.40 is: 122,247.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,872.40 : 128,808.60 = 81,498.40 : x
  2. Step 2: Convert to fraction form
    85,872.40/128,808.60 = 81,498.40/x
  3. Step 3: Cross multiply
    85,872.40x = 128,808.60 × 81,498.40
  4. Step 4: Simplify right side
    85,872.40x = 10,497,694,806.24
  5. Step 5: Solve for x
    x = 10,497,694,806.24/85,872.40
  6. Step 6: Final answer
    x = 122,247.60

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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.