Home / 21,779.20-32,668.80-10,115.20

Finding the Fourth Proportional to 21,779.20, 32,668.80 and 10,115.20

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Solution

The fourth proportional to 21,779.20, 32,668.80 and 10,115.20 is: 15,172.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,779.20 : 32,668.80 = 10,115.20 : x
  2. Step 2: Convert to fraction form
    21,779.20/32,668.80 = 10,115.20/x
  3. Step 3: Cross multiply
    21,779.20x = 32,668.80 × 10,115.20
  4. Step 4: Simplify right side
    21,779.20x = 330,451,445.76
  5. Step 5: Solve for x
    x = 330,451,445.76/21,779.20
  6. Step 6: Final answer
    x = 15,172.80

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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.