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Finding the Fourth Proportional to 8,812.70, 13,215.85 and 4,428.70

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Solution

The fourth proportional to 8,812.70, 13,215.85 and 4,428.70 is: 6,641.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,812.70 : 13,215.85 = 4,428.70 : x
  2. Step 2: Convert to fraction form
    8,812.70/13,215.85 = 4,428.70/x
  3. Step 3: Cross multiply
    8,812.70x = 13,215.85 × 4,428.70
  4. Step 4: Simplify right side
    8,812.70x = 58,529,034.90
  5. Step 5: Solve for x
    x = 58,529,034.90/8,812.70
  6. Step 6: Final answer
    x = 6,641.44

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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.