Home / 20,779.88-28,685.67-13,236.55

Finding the Fourth Proportional to 20,779.88, 28,685.67 and 13,236.55

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Solution

The fourth proportional to 20,779.88, 28,685.67 and 13,236.55 is: 18,272.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.88 : 28,685.67 = 13,236.55 : x
  2. Step 2: Convert to fraction form
    20,779.88/28,685.67 = 13,236.55/x
  3. Step 3: Cross multiply
    20,779.88x = 28,685.67 × 13,236.55
  4. Step 4: Simplify right side
    20,779.88x = 379,699,095.63
  5. Step 5: Solve for x
    x = 379,699,095.63/20,779.88
  6. Step 6: Final answer
    x = 18,272.44

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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.