Home / 20,779.20-28,645.65-12,816.09

Finding the Fourth Proportional to 20,779.20, 28,645.65 and 12,816.09

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Solution

The fourth proportional to 20,779.20, 28,645.65 and 12,816.09 is: 17,667.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,779.20 : 28,645.65 = 12,816.09 : x
  2. Step 2: Convert to fraction form
    20,779.20/28,645.65 = 12,816.09/x
  3. Step 3: Cross multiply
    20,779.20x = 28,645.65 × 12,816.09
  4. Step 4: Simplify right side
    20,779.20x = 367,125,228.51
  5. Step 5: Solve for x
    x = 367,125,228.51/20,779.20
  6. Step 6: Final answer
    x = 17,667.92

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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.