Home / 20,831.18-28,747.04-11,399.76

Finding the Fourth Proportional to 20,831.18, 28,747.04 and 11,399.76

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Solution

The fourth proportional to 20,831.18, 28,747.04 and 11,399.76 is: 15,731.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,831.18 : 28,747.04 = 11,399.76 : x
  2. Step 2: Convert to fraction form
    20,831.18/28,747.04 = 11,399.76/x
  3. Step 3: Cross multiply
    20,831.18x = 28,747.04 × 11,399.76
  4. Step 4: Simplify right side
    20,831.18x = 327,709,356.71
  5. Step 5: Solve for x
    x = 327,709,356.71/20,831.18
  6. Step 6: Final answer
    x = 15,731.68

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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.