Home / 21,220.80-31,831.20-16,555.20

Finding the Fourth Proportional to 21,220.80, 31,831.20 and 16,555.20

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Solution

The fourth proportional to 21,220.80, 31,831.20 and 16,555.20 is: 24,832.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,220.80 : 31,831.20 = 16,555.20 : x
  2. Step 2: Convert to fraction form
    21,220.80/31,831.20 = 16,555.20/x
  3. Step 3: Cross multiply
    21,220.80x = 31,831.20 × 16,555.20
  4. Step 4: Simplify right side
    21,220.80x = 526,971,882.24
  5. Step 5: Solve for x
    x = 526,971,882.24/21,220.80
  6. Step 6: Final answer
    x = 24,832.80

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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.