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Finding the Fourth Proportional to 8,642.46, 12,966.89 and 6,991.89

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Solution

The fourth proportional to 8,642.46, 12,966.89 and 6,991.89 is: 10,490.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,642.46 : 12,966.89 = 6,991.89 : x
  2. Step 2: Convert to fraction form
    8,642.46/12,966.89 = 6,991.89/x
  3. Step 3: Cross multiply
    8,642.46x = 12,966.89 × 6,991.89
  4. Step 4: Simplify right side
    8,642.46x = 90,662,984.94
  5. Step 5: Solve for x
    x = 90,662,984.94/8,642.46
  6. Step 6: Final answer
    x = 10,490.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.