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Finding the Fourth Proportional to 7,147.40, 9,863.28 and 3,917.19

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Solution

The fourth proportional to 7,147.40, 9,863.28 and 3,917.19 is: 5,405.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,147.40 : 9,863.28 = 3,917.19 : x
  2. Step 2: Convert to fraction form
    7,147.40/9,863.28 = 3,917.19/x
  3. Step 3: Cross multiply
    7,147.40x = 9,863.28 × 3,917.19
  4. Step 4: Simplify right side
    7,147.40x = 38,636,341.78
  5. Step 5: Solve for x
    x = 38,636,341.78/7,147.40
  6. Step 6: Final answer
    x = 5,405.65

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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.