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Finding the Fourth Proportional to 6,987.70, 9,640.02 and 5,920.90

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Solution

The fourth proportional to 6,987.70, 9,640.02 and 5,920.90 is: 8,168.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,987.70 : 9,640.02 = 5,920.90 : x
  2. Step 2: Convert to fraction form
    6,987.70/9,640.02 = 5,920.90/x
  3. Step 3: Cross multiply
    6,987.70x = 9,640.02 × 5,920.90
  4. Step 4: Simplify right side
    6,987.70x = 57,077,594.42
  5. Step 5: Solve for x
    x = 57,077,594.42/6,987.70
  6. Step 6: Final answer
    x = 8,168.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.