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Finding the Fourth Proportional to 5,260.20, 7,890.30 and 4,478.40

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Solution

The fourth proportional to 5,260.20, 7,890.30 and 4,478.40 is: 6,717.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,260.20 : 7,890.30 = 4,478.40 : x
  2. Step 2: Convert to fraction form
    5,260.20/7,890.30 = 4,478.40/x
  3. Step 3: Cross multiply
    5,260.20x = 7,890.30 × 4,478.40
  4. Step 4: Simplify right side
    5,260.20x = 35,335,919.52
  5. Step 5: Solve for x
    x = 35,335,919.52/5,260.20
  6. Step 6: Final answer
    x = 6,717.60

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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.