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Finding the Fourth Proportional to 8,988.91, 12,406.90 and 5,805.75

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Solution

The fourth proportional to 8,988.91, 12,406.90 and 5,805.75 is: 8,013.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,988.91 : 12,406.90 = 5,805.75 : x
  2. Step 2: Convert to fraction form
    8,988.91/12,406.90 = 5,805.75/x
  3. Step 3: Cross multiply
    8,988.91x = 12,406.90 × 5,805.75
  4. Step 4: Simplify right side
    8,988.91x = 72,031,359.68
  5. Step 5: Solve for x
    x = 72,031,359.68/8,988.91
  6. Step 6: Final answer
    x = 8,013.36

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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.