Home / 21,980.15-30,315.87-18,919.21

Finding the Fourth Proportional to 21,980.15, 30,315.87 and 18,919.21

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Solution

The fourth proportional to 21,980.15, 30,315.87 and 18,919.21 is: 26,094.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,980.15 : 30,315.87 = 18,919.21 : x
  2. Step 2: Convert to fraction form
    21,980.15/30,315.87 = 18,919.21/x
  3. Step 3: Cross multiply
    21,980.15x = 30,315.87 × 18,919.21
  4. Step 4: Simplify right side
    21,980.15x = 573,552,514.91
  5. Step 5: Solve for x
    x = 573,552,514.91/21,980.15
  6. Step 6: Final answer
    x = 26,094.11

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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.