Home / 21,911.08-30,243.49-12,961.70

Finding the Fourth Proportional to 21,911.08, 30,243.49 and 12,961.70

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Solution

The fourth proportional to 21,911.08, 30,243.49 and 12,961.70 is: 17,890.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,911.08 : 30,243.49 = 12,961.70 : x
  2. Step 2: Convert to fraction form
    21,911.08/30,243.49 = 12,961.70/x
  3. Step 3: Cross multiply
    21,911.08x = 30,243.49 × 12,961.70
  4. Step 4: Simplify right side
    21,911.08x = 392,006,860.71
  5. Step 5: Solve for x
    x = 392,006,860.71/21,911.08
  6. Step 6: Final answer
    x = 17,890.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.