Home / 21,931.60-32,908.20-12,578.80

Finding the Fourth Proportional to 21,931.60, 32,908.20 and 12,578.80

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Solution

The fourth proportional to 21,931.60, 32,908.20 and 12,578.80 is: 18,874.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,931.60 : 32,908.20 = 12,578.80 : x
  2. Step 2: Convert to fraction form
    21,931.60/32,908.20 = 12,578.80/x
  3. Step 3: Cross multiply
    21,931.60x = 32,908.20 × 12,578.80
  4. Step 4: Simplify right side
    21,931.60x = 413,945,666.16
  5. Step 5: Solve for x
    x = 413,945,666.16/21,931.60
  6. Step 6: Final answer
    x = 18,874.39

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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.