Home / 20,779.42-28,675.47-12,821.62

Finding the Fourth Proportional to 20,779.42, 28,675.47 and 12,821.62

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Solution

The fourth proportional to 20,779.42, 28,675.47 and 12,821.62 is: 17,693.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.42 : 28,675.47 = 12,821.62 : x
  2. Step 2: Convert to fraction form
    20,779.42/28,675.47 = 12,821.62/x
  3. Step 3: Cross multiply
    20,779.42x = 28,675.47 × 12,821.62
  4. Step 4: Simplify right side
    20,779.42x = 367,665,979.66
  5. Step 5: Solve for x
    x = 367,665,979.66/20,779.42
  6. Step 6: Final answer
    x = 17,693.76

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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.