Home / 20,872.54-28,831.71-15,558.13

Finding the Fourth Proportional to 20,872.54, 28,831.71 and 15,558.13

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Solution

The fourth proportional to 20,872.54, 28,831.71 and 15,558.13 is: 21,490.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.54 : 28,831.71 = 15,558.13 : x
  2. Step 2: Convert to fraction form
    20,872.54/28,831.71 = 15,558.13/x
  3. Step 3: Cross multiply
    20,872.54x = 28,831.71 × 15,558.13
  4. Step 4: Simplify right side
    20,872.54x = 448,567,492.30
  5. Step 5: Solve for x
    x = 448,567,492.30/20,872.54
  6. Step 6: Final answer
    x = 21,490.80

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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.