Home / 20,985.42-28,961.37-11,787.72

Finding the Fourth Proportional to 20,985.42, 28,961.37 and 11,787.72

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Solution

The fourth proportional to 20,985.42, 28,961.37 and 11,787.72 is: 16,267.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,985.42 : 28,961.37 = 11,787.72 : x
  2. Step 2: Convert to fraction form
    20,985.42/28,961.37 = 11,787.72/x
  3. Step 3: Cross multiply
    20,985.42x = 28,961.37 × 11,787.72
  4. Step 4: Simplify right side
    20,985.42x = 341,388,520.38
  5. Step 5: Solve for x
    x = 341,388,520.38/20,985.42
  6. Step 6: Final answer
    x = 16,267.89

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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.