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Finding the Fourth Proportional to 8,507.70, 12,690.81 and 8,371.62

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Solution

The fourth proportional to 8,507.70, 12,690.81 and 8,371.62 is: 12,487.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,507.70 : 12,690.81 = 8,371.62 : x
  2. Step 2: Convert to fraction form
    8,507.70/12,690.81 = 8,371.62/x
  3. Step 3: Cross multiply
    8,507.70x = 12,690.81 × 8,371.62
  4. Step 4: Simplify right side
    8,507.70x = 106,242,638.81
  5. Step 5: Solve for x
    x = 106,242,638.81/8,507.70
  6. Step 6: Final answer
    x = 12,487.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.