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Finding the Fourth Proportional to 85,470.80, 128,206.20 and 72,786.20

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Solution

The fourth proportional to 85,470.80, 128,206.20 and 72,786.20 is: 109,179.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,470.80 : 128,206.20 = 72,786.20 : x
  2. Step 2: Convert to fraction form
    85,470.80/128,206.20 = 72,786.20/x
  3. Step 3: Cross multiply
    85,470.80x = 128,206.20 × 72,786.20
  4. Step 4: Simplify right side
    85,470.80x = 9,331,642,114.44
  5. Step 5: Solve for x
    x = 9,331,642,114.44/85,470.80
  6. Step 6: Final answer
    x = 109,179.30

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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.