Home / 21,166.78-31,722.32-11,811.20

Finding the Fourth Proportional to 21,166.78, 31,722.32 and 11,811.20

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Solution

The fourth proportional to 21,166.78, 31,722.32 and 11,811.20 is: 17,701.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,166.78 : 31,722.32 = 11,811.20 : x
  2. Step 2: Convert to fraction form
    21,166.78/31,722.32 = 11,811.20/x
  3. Step 3: Cross multiply
    21,166.78x = 31,722.32 × 11,811.20
  4. Step 4: Simplify right side
    21,166.78x = 374,678,606.93
  5. Step 5: Solve for x
    x = 374,678,606.93/21,166.78
  6. Step 6: Final answer
    x = 17,701.26

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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.