Home / 21,116.89-31,612.22-12,771.66

Finding the Fourth Proportional to 21,116.89, 31,612.22 and 12,771.66

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Solution

The fourth proportional to 21,116.89, 31,612.22 and 12,771.66 is: 19,119.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,116.89 : 31,612.22 = 12,771.66 : x
  2. Step 2: Convert to fraction form
    21,116.89/31,612.22 = 12,771.66/x
  3. Step 3: Cross multiply
    21,116.89x = 31,612.22 × 12,771.66
  4. Step 4: Simplify right side
    21,116.89x = 403,740,525.69
  5. Step 5: Solve for x
    x = 403,740,525.69/21,116.89
  6. Step 6: Final answer
    x = 19,119.32

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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.