Home / 21,781.78-30,058.45-12,221.84

Finding the Fourth Proportional to 21,781.78, 30,058.45 and 12,221.84

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Solution

The fourth proportional to 21,781.78, 30,058.45 and 12,221.84 is: 16,865.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,781.78 : 30,058.45 = 12,221.84 : x
  2. Step 2: Convert to fraction form
    21,781.78/30,058.45 = 12,221.84/x
  3. Step 3: Cross multiply
    21,781.78x = 30,058.45 × 12,221.84
  4. Step 4: Simplify right side
    21,781.78x = 367,369,566.55
  5. Step 5: Solve for x
    x = 367,369,566.55/21,781.78
  6. Step 6: Final answer
    x = 16,865.91

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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.