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Finding the Fourth Proportional to 11,920.88, 17,816.62 and 10,987.12

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Solution

The fourth proportional to 11,920.88, 17,816.62 and 10,987.12 is: 16,421.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.88 : 17,816.62 = 10,987.12 : x
  2. Step 2: Convert to fraction form
    11,920.88/17,816.62 = 10,987.12/x
  3. Step 3: Cross multiply
    11,920.88x = 17,816.62 × 10,987.12
  4. Step 4: Simplify right side
    11,920.88x = 195,753,341.93
  5. Step 5: Solve for x
    x = 195,753,341.93/11,920.88
  6. Step 6: Final answer
    x = 16,421.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.