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Finding the Fourth Proportional to 7,980.98, 10,999.40 and 6,493.82

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Solution

The fourth proportional to 7,980.98, 10,999.40 and 6,493.82 is: 8,949.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980.98 : 10,999.40 = 6,493.82 : x
  2. Step 2: Convert to fraction form
    7,980.98/10,999.40 = 6,493.82/x
  3. Step 3: Cross multiply
    7,980.98x = 10,999.40 × 6,493.82
  4. Step 4: Simplify right side
    7,980.98x = 71,428,123.71
  5. Step 5: Solve for x
    x = 71,428,123.71/7,980.98
  6. Step 6: Final answer
    x = 8,949.79

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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.