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Finding the Fourth Proportional to 8,428.32, 12,640.32 and 5,795.28

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Solution

The fourth proportional to 8,428.32, 12,640.32 and 5,795.28 is: 8,691.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,428.32 : 12,640.32 = 5,795.28 : x
  2. Step 2: Convert to fraction form
    8,428.32/12,640.32 = 5,795.28/x
  3. Step 3: Cross multiply
    8,428.32x = 12,640.32 × 5,795.28
  4. Step 4: Simplify right side
    8,428.32x = 73,254,193.69
  5. Step 5: Solve for x
    x = 73,254,193.69/8,428.32
  6. Step 6: Final answer
    x = 8,691.43

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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.