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Finding the Fourth Proportional to 7,123.24, 9,829.20 and 3,979

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Solution

The fourth proportional to 7,123.24, 9,829.20 and 3,979 is: 5,490.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,123.24 : 9,829.20 = 3,979 : x
  2. Step 2: Convert to fraction form
    7,123.24/9,829.20 = 3,979/x
  3. Step 3: Cross multiply
    7,123.24x = 9,829.20 × 3,979
  4. Step 4: Simplify right side
    7,123.24x = 39,110,386.80
  5. Step 5: Solve for x
    x = 39,110,386.80/7,123.24
  6. Step 6: Final answer
    x = 5,490.53

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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.