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Finding the Fourth Proportional to 40,919.70, 61,418.70 and 21,212.40

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Solution

The fourth proportional to 40,919.70, 61,418.70 and 21,212.40 is: 31,838.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,919.70 : 61,418.70 = 21,212.40 : x
  2. Step 2: Convert to fraction form
    40,919.70/61,418.70 = 21,212.40/x
  3. Step 3: Cross multiply
    40,919.70x = 61,418.70 × 21,212.40
  4. Step 4: Simplify right side
    40,919.70x = 1,302,838,031.88
  5. Step 5: Solve for x
    x = 1,302,838,031.88/40,919.70
  6. Step 6: Final answer
    x = 31,838.90

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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.