Home / 21,987.32-30,341.79-12,555.88

Finding the Fourth Proportional to 21,987.32, 30,341.79 and 12,555.88

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Solution

The fourth proportional to 21,987.32, 30,341.79 and 12,555.88 is: 17,326.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.32 : 30,341.79 = 12,555.88 : x
  2. Step 2: Convert to fraction form
    21,987.32/30,341.79 = 12,555.88/x
  3. Step 3: Cross multiply
    21,987.32x = 30,341.79 × 12,555.88
  4. Step 4: Simplify right side
    21,987.32x = 380,967,798.37
  5. Step 5: Solve for x
    x = 380,967,798.37/21,987.32
  6. Step 6: Final answer
    x = 17,326.71

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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.