Home / 11,147.29-15,357.40-7,784.78

Finding the Fourth Proportional to 11,147.29, 15,357.40 and 7,784.78

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Solution

The fourth proportional to 11,147.29, 15,357.40 and 7,784.78 is: 10,724.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,147.29 : 15,357.40 = 7,784.78 : x
  2. Step 2: Convert to fraction form
    11,147.29/15,357.40 = 7,784.78/x
  3. Step 3: Cross multiply
    11,147.29x = 15,357.40 × 7,784.78
  4. Step 4: Simplify right side
    11,147.29x = 119,553,884.12
  5. Step 5: Solve for x
    x = 119,553,884.12/11,147.29
  6. Step 6: Final answer
    x = 10,724.93

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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.