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Finding the Fourth Proportional to 9,918.18, 13,694.85 and 7,428.78

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Solution

The fourth proportional to 9,918.18, 13,694.85 and 7,428.78 is: 10,257.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,918.18 : 13,694.85 = 7,428.78 : x
  2. Step 2: Convert to fraction form
    9,918.18/13,694.85 = 7,428.78/x
  3. Step 3: Cross multiply
    9,918.18x = 13,694.85 × 7,428.78
  4. Step 4: Simplify right side
    9,918.18x = 101,736,027.78
  5. Step 5: Solve for x
    x = 101,736,027.78/9,918.18
  6. Step 6: Final answer
    x = 10,257.53

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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.