Home / 7,123.43-9,829.61-4,139.90

Finding the Fourth Proportional to 7,123.43, 9,829.61 and 4,139.90

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Solution

The fourth proportional to 7,123.43, 9,829.61 and 4,139.90 is: 5,712.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,123.43 : 9,829.61 = 4,139.90 : x
  2. Step 2: Convert to fraction form
    7,123.43/9,829.61 = 4,139.90/x
  3. Step 3: Cross multiply
    7,123.43x = 9,829.61 × 4,139.90
  4. Step 4: Simplify right side
    7,123.43x = 40,693,581.74
  5. Step 5: Solve for x
    x = 40,693,581.74/7,123.43
  6. Step 6: Final answer
    x = 5,712.64

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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.