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Finding the Fourth Proportional to 8,687.02, 11,979.30 and 7,726.90

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Solution

The fourth proportional to 8,687.02, 11,979.30 and 7,726.90 is: 10,655.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,687.02 : 11,979.30 = 7,726.90 : x
  2. Step 2: Convert to fraction form
    8,687.02/11,979.30 = 7,726.90/x
  3. Step 3: Cross multiply
    8,687.02x = 11,979.30 × 7,726.90
  4. Step 4: Simplify right side
    8,687.02x = 92,562,853.17
  5. Step 5: Solve for x
    x = 92,562,853.17/8,687.02
  6. Step 6: Final answer
    x = 10,655.31

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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.