Home / 15,781.68-21,780.23-11,795.85

Finding the Fourth Proportional to 15,781.68, 21,780.23 and 11,795.85

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Solution

The fourth proportional to 15,781.68, 21,780.23 and 11,795.85 is: 16,279.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,781.68 : 21,780.23 = 11,795.85 : x
  2. Step 2: Convert to fraction form
    15,781.68/21,780.23 = 11,795.85/x
  3. Step 3: Cross multiply
    15,781.68x = 21,780.23 × 11,795.85
  4. Step 4: Simplify right side
    15,781.68x = 256,916,267.07
  5. Step 5: Solve for x
    x = 256,916,267.07/15,781.68
  6. Step 6: Final answer
    x = 16,279.40

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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.