Home / 20,861.78-31,288.93-5,865.30

Finding the Fourth Proportional to 20,861.78, 31,288.93 and 5,865.30

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Solution

The fourth proportional to 20,861.78, 31,288.93 and 5,865.30 is: 8,796.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.78 : 31,288.93 = 5,865.30 : x
  2. Step 2: Convert to fraction form
    20,861.78/31,288.93 = 5,865.30/x
  3. Step 3: Cross multiply
    20,861.78x = 31,288.93 × 5,865.30
  4. Step 4: Simplify right side
    20,861.78x = 183,518,981.30
  5. Step 5: Solve for x
    x = 183,518,981.30/20,861.78
  6. Step 6: Final answer
    x = 8,796.90

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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.