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Finding the Fourth Proportional to 8,428.88, 12,641.08 and 5,130.56

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Solution

The fourth proportional to 8,428.88, 12,641.08 and 5,130.56 is: 7,694.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,428.88 : 12,641.08 = 5,130.56 : x
  2. Step 2: Convert to fraction form
    8,428.88/12,641.08 = 5,130.56/x
  3. Step 3: Cross multiply
    8,428.88x = 12,641.08 × 5,130.56
  4. Step 4: Simplify right side
    8,428.88x = 64,855,819.40
  5. Step 5: Solve for x
    x = 64,855,819.40/8,428.88
  6. Step 6: Final answer
    x = 7,694.48

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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.