Home / 21,987.20-32,979.36-6,406.40

Finding the Fourth Proportional to 21,987.20, 32,979.36 and 6,406.40

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Solution

The fourth proportional to 21,987.20, 32,979.36 and 6,406.40 is: 9,609.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,987.20 : 32,979.36 = 6,406.40 : x
  2. Step 2: Convert to fraction form
    21,987.20/32,979.36 = 6,406.40/x
  3. Step 3: Cross multiply
    21,987.20x = 32,979.36 × 6,406.40
  4. Step 4: Simplify right side
    21,987.20x = 211,278,971.90
  5. Step 5: Solve for x
    x = 211,278,971.90/21,987.20
  6. Step 6: Final answer
    x = 9,609.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.