Home / 20,775.78-28,670.10-11,344.50

Finding the Fourth Proportional to 20,775.78, 28,670.10 and 11,344.50

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Solution

The fourth proportional to 20,775.78, 28,670.10 and 11,344.50 is: 15,655.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,775.78 : 28,670.10 = 11,344.50 : x
  2. Step 2: Convert to fraction form
    20,775.78/28,670.10 = 11,344.50/x
  3. Step 3: Cross multiply
    20,775.78x = 28,670.10 × 11,344.50
  4. Step 4: Simplify right side
    20,775.78x = 325,247,949.45
  5. Step 5: Solve for x
    x = 325,247,949.45/20,775.78
  6. Step 6: Final answer
    x = 15,655.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.