Home / 20,881.35-28,816.28-11,321.25

Finding the Fourth Proportional to 20,881.35, 28,816.28 and 11,321.25

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Solution

The fourth proportional to 20,881.35, 28,816.28 and 11,321.25 is: 15,623.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,881.35 : 28,816.28 = 11,321.25 : x
  2. Step 2: Convert to fraction form
    20,881.35/28,816.28 = 11,321.25/x
  3. Step 3: Cross multiply
    20,881.35x = 28,816.28 × 11,321.25
  4. Step 4: Simplify right side
    20,881.35x = 326,236,381.67
  5. Step 5: Solve for x
    x = 326,236,381.67/20,881.35
  6. Step 6: Final answer
    x = 15,623.34

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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.