Home / 20,669.66-28,489.40-15,822.72

Finding the Fourth Proportional to 20,669.66, 28,489.40 and 15,822.72

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Solution

The fourth proportional to 20,669.66, 28,489.40 and 15,822.72 is: 21,808.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,669.66 : 28,489.40 = 15,822.72 : x
  2. Step 2: Convert to fraction form
    20,669.66/28,489.40 = 15,822.72/x
  3. Step 3: Cross multiply
    20,669.66x = 28,489.40 × 15,822.72
  4. Step 4: Simplify right side
    20,669.66x = 450,779,654.76
  5. Step 5: Solve for x
    x = 450,779,654.76/20,669.66
  6. Step 6: Final answer
    x = 21,808.76

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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.