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Finding the Fourth Proportional to 85,780.80, 128,671.20 and 80,969.40

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Solution

The fourth proportional to 85,780.80, 128,671.20 and 80,969.40 is: 121,454.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,780.80 : 128,671.20 = 80,969.40 : x
  2. Step 2: Convert to fraction form
    85,780.80/128,671.20 = 80,969.40/x
  3. Step 3: Cross multiply
    85,780.80x = 128,671.20 × 80,969.40
  4. Step 4: Simplify right side
    85,780.80x = 10,418,429,861.28
  5. Step 5: Solve for x
    x = 10,418,429,861.28/85,780.80
  6. Step 6: Final answer
    x = 121,454.10

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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.