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Finding the Fourth Proportional to 8,503.60, 11,725.12 and 7,789.20

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Solution

The fourth proportional to 8,503.60, 11,725.12 and 7,789.20 is: 10,740.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,503.60 : 11,725.12 = 7,789.20 : x
  2. Step 2: Convert to fraction form
    8,503.60/11,725.12 = 7,789.20/x
  3. Step 3: Cross multiply
    8,503.60x = 11,725.12 × 7,789.20
  4. Step 4: Simplify right side
    8,503.60x = 91,329,304.70
  5. Step 5: Solve for x
    x = 91,329,304.70/8,503.60
  6. Step 6: Final answer
    x = 10,740.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.