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Finding the Fourth Proportional to 7,920.28, 10,918.19 and 6,238.32

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Solution

The fourth proportional to 7,920.28, 10,918.19 and 6,238.32 is: 8,599.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,920.28 : 10,918.19 = 6,238.32 : x
  2. Step 2: Convert to fraction form
    7,920.28/10,918.19 = 6,238.32/x
  3. Step 3: Cross multiply
    7,920.28x = 10,918.19 × 6,238.32
  4. Step 4: Simplify right side
    7,920.28x = 68,111,137.69
  5. Step 5: Solve for x
    x = 68,111,137.69/7,920.28
  6. Step 6: Final answer
    x = 8,599.59

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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.