Home / 20,783.28-31,285.96-18,640

Finding the Fourth Proportional to 20,783.28, 31,285.96 and 18,640

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Solution

The fourth proportional to 20,783.28, 31,285.96 and 18,640 is: 28,059.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.28 : 31,285.96 = 18,640 : x
  2. Step 2: Convert to fraction form
    20,783.28/31,285.96 = 18,640/x
  3. Step 3: Cross multiply
    20,783.28x = 31,285.96 × 18,640
  4. Step 4: Simplify right side
    20,783.28x = 583,170,294.40
  5. Step 5: Solve for x
    x = 583,170,294.40/20,783.28
  6. Step 6: Final answer
    x = 28,059.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.