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Finding the Fourth Proportional to 8,138.60, 12,207.90 and 6,871.40

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Solution

The fourth proportional to 8,138.60, 12,207.90 and 6,871.40 is: 10,307.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.60 : 12,207.90 = 6,871.40 : x
  2. Step 2: Convert to fraction form
    8,138.60/12,207.90 = 6,871.40/x
  3. Step 3: Cross multiply
    8,138.60x = 12,207.90 × 6,871.40
  4. Step 4: Simplify right side
    8,138.60x = 83,885,364.06
  5. Step 5: Solve for x
    x = 83,885,364.06/8,138.60
  6. Step 6: Final answer
    x = 10,307.10

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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.