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Finding the Fourth Proportional to 84,612.80, 126,919.20 and 79,428.80

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Solution

The fourth proportional to 84,612.80, 126,919.20 and 79,428.80 is: 119,143.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,612.80 : 126,919.20 = 79,428.80 : x
  2. Step 2: Convert to fraction form
    84,612.80/126,919.20 = 79,428.80/x
  3. Step 3: Cross multiply
    84,612.80x = 126,919.20 × 79,428.80
  4. Step 4: Simplify right side
    84,612.80x = 10,081,039,752.96
  5. Step 5: Solve for x
    x = 10,081,039,752.96/84,612.80
  6. Step 6: Final answer
    x = 119,143.20

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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.