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Finding the Fourth Proportional to 5,422.40, 8,117.40 and 4,839.20

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Solution

The fourth proportional to 5,422.40, 8,117.40 and 4,839.20 is: 7,244.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,422.40 : 8,117.40 = 4,839.20 : x
  2. Step 2: Convert to fraction form
    5,422.40/8,117.40 = 4,839.20/x
  3. Step 3: Cross multiply
    5,422.40x = 8,117.40 × 4,839.20
  4. Step 4: Simplify right side
    5,422.40x = 39,281,722.08
  5. Step 5: Solve for x
    x = 39,281,722.08/5,422.40
  6. Step 6: Final answer
    x = 7,244.34

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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.