Home / 20,780.24-31,150.20-10,360.40

Finding the Fourth Proportional to 20,780.24, 31,150.20 and 10,360.40

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Solution

The fourth proportional to 20,780.24, 31,150.20 and 10,360.40 is: 15,530.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,780.24 : 31,150.20 = 10,360.40 : x
  2. Step 2: Convert to fraction form
    20,780.24/31,150.20 = 10,360.40/x
  3. Step 3: Cross multiply
    20,780.24x = 31,150.20 × 10,360.40
  4. Step 4: Simplify right side
    20,780.24x = 322,728,532.08
  5. Step 5: Solve for x
    x = 322,728,532.08/20,780.24
  6. Step 6: Final answer
    x = 15,530.55

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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.