Home / 20,890.80-28,831.68-11,460.24

Finding the Fourth Proportional to 20,890.80, 28,831.68 and 11,460.24

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Solution

The fourth proportional to 20,890.80, 28,831.68 and 11,460.24 is: 15,816.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,890.80 : 28,831.68 = 11,460.24 : x
  2. Step 2: Convert to fraction form
    20,890.80/28,831.68 = 11,460.24/x
  3. Step 3: Cross multiply
    20,890.80x = 28,831.68 × 11,460.24
  4. Step 4: Simplify right side
    20,890.80x = 330,417,972.40
  5. Step 5: Solve for x
    x = 330,417,972.40/20,890.80
  6. Step 6: Final answer
    x = 15,816.43

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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.