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Finding the Fourth Proportional to 7,907.78, 11,836.80 and 5,428.10

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Solution

The fourth proportional to 7,907.78, 11,836.80 and 5,428.10 is: 8,125.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,907.78 : 11,836.80 = 5,428.10 : x
  2. Step 2: Convert to fraction form
    7,907.78/11,836.80 = 5,428.10/x
  3. Step 3: Cross multiply
    7,907.78x = 11,836.80 × 5,428.10
  4. Step 4: Simplify right side
    7,907.78x = 64,251,334.08
  5. Step 5: Solve for x
    x = 64,251,334.08/7,907.78
  6. Step 6: Final answer
    x = 8,125.08

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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.