Home / 21,109.88-31,675.62-8,639.12

Finding the Fourth Proportional to 21,109.88, 31,675.62 and 8,639.12

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Solution

The fourth proportional to 21,109.88, 31,675.62 and 8,639.12 is: 12,963.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.88 : 31,675.62 = 8,639.12 : x
  2. Step 2: Convert to fraction form
    21,109.88/31,675.62 = 8,639.12/x
  3. Step 3: Cross multiply
    21,109.88x = 31,675.62 × 8,639.12
  4. Step 4: Simplify right side
    21,109.88x = 273,649,482.25
  5. Step 5: Solve for x
    x = 273,649,482.25/21,109.88
  6. Step 6: Final answer
    x = 12,963.10

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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.