Home / 20,430.20-30,644.69-5,640.02

Finding the Fourth Proportional to 20,430.20, 30,644.69 and 5,640.02

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Solution

The fourth proportional to 20,430.20, 30,644.69 and 5,640.02 is: 8,459.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,430.20 : 30,644.69 = 5,640.02 : x
  2. Step 2: Convert to fraction form
    20,430.20/30,644.69 = 5,640.02/x
  3. Step 3: Cross multiply
    20,430.20x = 30,644.69 × 5,640.02
  4. Step 4: Simplify right side
    20,430.20x = 172,836,664.49
  5. Step 5: Solve for x
    x = 172,836,664.49/20,430.20
  6. Step 6: Final answer
    x = 8,459.86

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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.