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Finding the Fourth Proportional to 12,691.20, 19,018.04 and 11,307.20

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Solution

The fourth proportional to 12,691.20, 19,018.04 and 11,307.20 is: 16,944.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,691.20 : 19,018.04 = 11,307.20 : x
  2. Step 2: Convert to fraction form
    12,691.20/19,018.04 = 11,307.20/x
  3. Step 3: Cross multiply
    12,691.20x = 19,018.04 × 11,307.20
  4. Step 4: Simplify right side
    12,691.20x = 215,040,781.89
  5. Step 5: Solve for x
    x = 215,040,781.89/12,691.20
  6. Step 6: Final answer
    x = 16,944.09

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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.