Home / 12,478.05-18,717.21-7,221.15

Finding the Fourth Proportional to 12,478.05, 18,717.21 and 7,221.15

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Solution

The fourth proportional to 12,478.05, 18,717.21 and 7,221.15 is: 10,831.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,478.05 : 18,717.21 = 7,221.15 : x
  2. Step 2: Convert to fraction form
    12,478.05/18,717.21 = 7,221.15/x
  3. Step 3: Cross multiply
    12,478.05x = 18,717.21 × 7,221.15
  4. Step 4: Simplify right side
    12,478.05x = 135,159,780.99
  5. Step 5: Solve for x
    x = 135,159,780.99/12,478.05
  6. Step 6: Final answer
    x = 10,831.80

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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.