Home / 20,783.18-31,172.65-5,200.81

Finding the Fourth Proportional to 20,783.18, 31,172.65 and 5,200.81

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Solution

The fourth proportional to 20,783.18, 31,172.65 and 5,200.81 is: 7,800.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,783.18 : 31,172.65 = 5,200.81 : x
  2. Step 2: Convert to fraction form
    20,783.18/31,172.65 = 5,200.81/x
  3. Step 3: Cross multiply
    20,783.18x = 31,172.65 × 5,200.81
  4. Step 4: Simplify right side
    20,783.18x = 162,122,938.91
  5. Step 5: Solve for x
    x = 162,122,938.91/20,783.18
  6. Step 6: Final answer
    x = 7,800.68

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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.