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Finding the Fourth Proportional to 8,786.70, 12,125.61 and 5,428.71

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Solution

The fourth proportional to 8,786.70, 12,125.61 and 5,428.71 is: 7,491.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,786.70 : 12,125.61 = 5,428.71 : x
  2. Step 2: Convert to fraction form
    8,786.70/12,125.61 = 5,428.71/x
  3. Step 3: Cross multiply
    8,786.70x = 12,125.61 × 5,428.71
  4. Step 4: Simplify right side
    8,786.70x = 65,826,420.26
  5. Step 5: Solve for x
    x = 65,826,420.26/8,786.70
  6. Step 6: Final answer
    x = 7,491.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.