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Finding the Fourth Proportional to 6,638.13, 9,947.12 and 4,290.93

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Solution

The fourth proportional to 6,638.13, 9,947.12 and 4,290.93 is: 6,429.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,638.13 : 9,947.12 = 4,290.93 : x
  2. Step 2: Convert to fraction form
    6,638.13/9,947.12 = 4,290.93/x
  3. Step 3: Cross multiply
    6,638.13x = 9,947.12 × 4,290.93
  4. Step 4: Simplify right side
    6,638.13x = 42,682,374.17
  5. Step 5: Solve for x
    x = 42,682,374.17/6,638.13
  6. Step 6: Final answer
    x = 6,429.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.