Home / 11,421.52-15,757.26-7,170.78

Finding the Fourth Proportional to 11,421.52, 15,757.26 and 7,170.78

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Solution

The fourth proportional to 11,421.52, 15,757.26 and 7,170.78 is: 9,892.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,421.52 : 15,757.26 = 7,170.78 : x
  2. Step 2: Convert to fraction form
    11,421.52/15,757.26 = 7,170.78/x
  3. Step 3: Cross multiply
    11,421.52x = 15,757.26 × 7,170.78
  4. Step 4: Simplify right side
    11,421.52x = 112,991,844.86
  5. Step 5: Solve for x
    x = 112,991,844.86/11,421.52
  6. Step 6: Final answer
    x = 9,892.89

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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.