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Finding the Fourth Proportional to 8,681.80, 11,981.97 and 4,905.15

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Solution

The fourth proportional to 8,681.80, 11,981.97 and 4,905.15 is: 6,769.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,681.80 : 11,981.97 = 4,905.15 : x
  2. Step 2: Convert to fraction form
    8,681.80/11,981.97 = 4,905.15/x
  3. Step 3: Cross multiply
    8,681.80x = 11,981.97 × 4,905.15
  4. Step 4: Simplify right side
    8,681.80x = 58,773,360.15
  5. Step 5: Solve for x
    x = 58,773,360.15/8,681.80
  6. Step 6: Final answer
    x = 6,769.72

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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.