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Finding the Fourth Proportional to 8,666.80, 11,960.20 and 5,131.76

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Solution

The fourth proportional to 8,666.80, 11,960.20 and 5,131.76 is: 7,081.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,666.80 : 11,960.20 = 5,131.76 : x
  2. Step 2: Convert to fraction form
    8,666.80/11,960.20 = 5,131.76/x
  3. Step 3: Cross multiply
    8,666.80x = 11,960.20 × 5,131.76
  4. Step 4: Simplify right side
    8,666.80x = 61,376,875.95
  5. Step 5: Solve for x
    x = 61,376,875.95/8,666.80
  6. Step 6: Final answer
    x = 7,081.84

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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.