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Finding the Fourth Proportional to 8,612.40, 12,902.40 and 8,029.20

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Solution

The fourth proportional to 8,612.40, 12,902.40 and 8,029.20 is: 12,028.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,612.40 : 12,902.40 = 8,029.20 : x
  2. Step 2: Convert to fraction form
    8,612.40/12,902.40 = 8,029.20/x
  3. Step 3: Cross multiply
    8,612.40x = 12,902.40 × 8,029.20
  4. Step 4: Simplify right side
    8,612.40x = 103,595,950.08
  5. Step 5: Solve for x
    x = 103,595,950.08/8,612.40
  6. Step 6: Final answer
    x = 12,028.70

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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.