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Finding the Fourth Proportional to 8,285.70, 12,428.54 and 5,680.74

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Solution

The fourth proportional to 8,285.70, 12,428.54 and 5,680.74 is: 8,521.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,285.70 : 12,428.54 = 5,680.74 : x
  2. Step 2: Convert to fraction form
    8,285.70/12,428.54 = 5,680.74/x
  3. Step 3: Cross multiply
    8,285.70x = 12,428.54 × 5,680.74
  4. Step 4: Simplify right side
    8,285.70x = 70,603,304.32
  5. Step 5: Solve for x
    x = 70,603,304.32/8,285.70
  6. Step 6: Final answer
    x = 8,521.10

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Similar ratio
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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.