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Finding the Fourth Proportional to 8,555.60, 11,812.28 and 7,657.78

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Solution

The fourth proportional to 8,555.60, 11,812.28 and 7,657.78 is: 10,572.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,555.60 : 11,812.28 = 7,657.78 : x
  2. Step 2: Convert to fraction form
    8,555.60/11,812.28 = 7,657.78/x
  3. Step 3: Cross multiply
    8,555.60x = 11,812.28 × 7,657.78
  4. Step 4: Simplify right side
    8,555.60x = 90,455,841.54
  5. Step 5: Solve for x
    x = 90,455,841.54/8,555.60
  6. Step 6: Final answer
    x = 10,572.71

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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.