Home / 20,765.79-31,157.81-10,902.78

Finding the Fourth Proportional to 20,765.79, 31,157.81 and 10,902.78

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Solution

The fourth proportional to 20,765.79, 31,157.81 and 10,902.78 is: 16,358.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,765.79 : 31,157.81 = 10,902.78 : x
  2. Step 2: Convert to fraction form
    20,765.79/31,157.81 = 10,902.78/x
  3. Step 3: Cross multiply
    20,765.79x = 31,157.81 × 10,902.78
  4. Step 4: Simplify right side
    20,765.79x = 339,706,747.71
  5. Step 5: Solve for x
    x = 339,706,747.71/20,765.79
  6. Step 6: Final answer
    x = 16,358.96

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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.