Home / 20,287.42-30,431.12-7,639.56

Finding the Fourth Proportional to 20,287.42, 30,431.12 and 7,639.56

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Solution

The fourth proportional to 20,287.42, 30,431.12 and 7,639.56 is: 11,459.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,287.42 : 30,431.12 = 7,639.56 : x
  2. Step 2: Convert to fraction form
    20,287.42/30,431.12 = 7,639.56/x
  3. Step 3: Cross multiply
    20,287.42x = 30,431.12 × 7,639.56
  4. Step 4: Simplify right side
    20,287.42x = 232,480,367.11
  5. Step 5: Solve for x
    x = 232,480,367.11/20,287.42
  6. Step 6: Final answer
    x = 11,459.34

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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.