Home / 20,424.51-30,639.24-7,278.21

Finding the Fourth Proportional to 20,424.51, 30,639.24 and 7,278.21

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Solution

The fourth proportional to 20,424.51, 30,639.24 and 7,278.21 is: 10,918.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,424.51 : 30,639.24 = 7,278.21 : x
  2. Step 2: Convert to fraction form
    20,424.51/30,639.24 = 7,278.21/x
  3. Step 3: Cross multiply
    20,424.51x = 30,639.24 × 7,278.21
  4. Step 4: Simplify right side
    20,424.51x = 222,998,822.96
  5. Step 5: Solve for x
    x = 222,998,822.96/20,424.51
  6. Step 6: Final answer
    x = 10,918.20

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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.