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Finding the Fourth Proportional to 7,139.49, 9,854.06 and 4,155.72

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Solution

The fourth proportional to 7,139.49, 9,854.06 and 4,155.72 is: 5,735.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.49 : 9,854.06 = 4,155.72 : x
  2. Step 2: Convert to fraction form
    7,139.49/9,854.06 = 4,155.72/x
  3. Step 3: Cross multiply
    7,139.49x = 9,854.06 × 4,155.72
  4. Step 4: Simplify right side
    7,139.49x = 40,950,693.44
  5. Step 5: Solve for x
    x = 40,950,693.44/7,139.49
  6. Step 6: Final answer
    x = 5,735.80

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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.