Home / 21,272.80-31,909.18-8,779.08

Finding the Fourth Proportional to 21,272.80, 31,909.18 and 8,779.08

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Solution

The fourth proportional to 21,272.80, 31,909.18 and 8,779.08 is: 13,168.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,272.80 : 31,909.18 = 8,779.08 : x
  2. Step 2: Convert to fraction form
    21,272.80/31,909.18 = 8,779.08/x
  3. Step 3: Cross multiply
    21,272.80x = 31,909.18 × 8,779.08
  4. Step 4: Simplify right side
    21,272.80x = 280,133,243.95
  5. Step 5: Solve for x
    x = 280,133,243.95/21,272.80
  6. Step 6: Final answer
    x = 13,168.61

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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.