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Finding the Fourth Proportional to 7,167.32, 9,890.84 and 3,980.76

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Solution

The fourth proportional to 7,167.32, 9,890.84 and 3,980.76 is: 5,493.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,167.32 : 9,890.84 = 3,980.76 : x
  2. Step 2: Convert to fraction form
    7,167.32/9,890.84 = 3,980.76/x
  3. Step 3: Cross multiply
    7,167.32x = 9,890.84 × 3,980.76
  4. Step 4: Simplify right side
    7,167.32x = 39,373,060.24
  5. Step 5: Solve for x
    x = 39,373,060.24/7,167.32
  6. Step 6: Final answer
    x = 5,493.41

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Half scale
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Double scale
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Similar ratio
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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.