Home / 20,728.78-31,102.35-10,865.71

Finding the Fourth Proportional to 20,728.78, 31,102.35 and 10,865.71

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Solution

The fourth proportional to 20,728.78, 31,102.35 and 10,865.71 is: 16,303.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,728.78 : 31,102.35 = 10,865.71 : x
  2. Step 2: Convert to fraction form
    20,728.78/31,102.35 = 10,865.71/x
  3. Step 3: Cross multiply
    20,728.78x = 31,102.35 × 10,865.71
  4. Step 4: Simplify right side
    20,728.78x = 337,949,115.42
  5. Step 5: Solve for x
    x = 337,949,115.42/20,728.78
  6. Step 6: Final answer
    x = 16,303.38

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1.5x scale

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.