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Finding the Fourth Proportional to 8,208.60, 12,312.90 and 7,139.40

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Solution

The fourth proportional to 8,208.60, 12,312.90 and 7,139.40 is: 10,709.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,208.60 : 12,312.90 = 7,139.40 : x
  2. Step 2: Convert to fraction form
    8,208.60/12,312.90 = 7,139.40/x
  3. Step 3: Cross multiply
    8,208.60x = 12,312.90 × 7,139.40
  4. Step 4: Simplify right side
    8,208.60x = 87,906,718.26
  5. Step 5: Solve for x
    x = 87,906,718.26/8,208.60
  6. Step 6: Final answer
    x = 10,709.10

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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.