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Finding the Fourth Proportional to 9,998.78, 15,000.60 and 3,428.06

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Solution

The fourth proportional to 9,998.78, 15,000.60 and 3,428.06 is: 5,142.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,998.78 : 15,000.60 = 3,428.06 : x
  2. Step 2: Convert to fraction form
    9,998.78/15,000.60 = 3,428.06/x
  3. Step 3: Cross multiply
    9,998.78x = 15,000.60 × 3,428.06
  4. Step 4: Simplify right side
    9,998.78x = 51,422,956.84
  5. Step 5: Solve for x
    x = 51,422,956.84/9,998.78
  6. Step 6: Final answer
    x = 5,142.92

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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.