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Finding the Fourth Proportional to 19,997.40, 29,959.20 and 11,681.40

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Solution

The fourth proportional to 19,997.40, 29,959.20 and 11,681.40 is: 17,500.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,997.40 : 29,959.20 = 11,681.40 : x
  2. Step 2: Convert to fraction form
    19,997.40/29,959.20 = 11,681.40/x
  3. Step 3: Cross multiply
    19,997.40x = 29,959.20 × 11,681.40
  4. Step 4: Simplify right side
    19,997.40x = 349,965,398.88
  5. Step 5: Solve for x
    x = 349,965,398.88/19,997.40
  6. Step 6: Final answer
    x = 17,500.55

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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.