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Finding the Fourth Proportional to 8,813.80, 12,378.20 and 8,813.80

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Solution

The fourth proportional to 8,813.80, 12,378.20 and 8,813.80 is: 12,378.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,813.80 : 12,378.20 = 8,813.80 : x
  2. Step 2: Convert to fraction form
    8,813.80/12,378.20 = 8,813.80/x
  3. Step 3: Cross multiply
    8,813.80x = 12,378.20 × 8,813.80
  4. Step 4: Simplify right side
    8,813.80x = 109,098,979.16
  5. Step 5: Solve for x
    x = 109,098,979.16/8,813.80
  6. Step 6: Final answer
    x = 12,378.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.