Home / 20,464.86-28,236.32-15,689.58

Finding the Fourth Proportional to 20,464.86, 28,236.32 and 15,689.58

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Solution

The fourth proportional to 20,464.86, 28,236.32 and 15,689.58 is: 21,647.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,464.86 : 28,236.32 = 15,689.58 : x
  2. Step 2: Convert to fraction form
    20,464.86/28,236.32 = 15,689.58/x
  3. Step 3: Cross multiply
    20,464.86x = 28,236.32 × 15,689.58
  4. Step 4: Simplify right side
    20,464.86x = 443,016,001.55
  5. Step 5: Solve for x
    x = 443,016,001.55/20,464.86
  6. Step 6: Final answer
    x = 21,647.64

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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.