Home / 20,890.42-31,313.76-9,787.75

Finding the Fourth Proportional to 20,890.42, 31,313.76 and 9,787.75

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Solution

The fourth proportional to 20,890.42, 31,313.76 and 9,787.75 is: 14,671.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.42 : 31,313.76 = 9,787.75 : x
  2. Step 2: Convert to fraction form
    20,890.42/31,313.76 = 9,787.75/x
  3. Step 3: Cross multiply
    20,890.42x = 31,313.76 × 9,787.75
  4. Step 4: Simplify right side
    20,890.42x = 306,491,254.44
  5. Step 5: Solve for x
    x = 306,491,254.44/20,890.42
  6. Step 6: Final answer
    x = 14,671.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.