Home / 15,780.32-21,618.72-15,189.44

Finding the Fourth Proportional to 15,780.32, 21,618.72 and 15,189.44

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Solution

The fourth proportional to 15,780.32, 21,618.72 and 15,189.44 is: 20,809.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,780.32 : 21,618.72 = 15,189.44 : x
  2. Step 2: Convert to fraction form
    15,780.32/21,618.72 = 15,189.44/x
  3. Step 3: Cross multiply
    15,780.32x = 21,618.72 × 15,189.44
  4. Step 4: Simplify right side
    15,780.32x = 328,376,250.32
  5. Step 5: Solve for x
    x = 328,376,250.32/15,780.32
  6. Step 6: Final answer
    x = 20,809.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.