Home / 21,178.20-29,221.20-12,794.52

Finding the Fourth Proportional to 21,178.20, 29,221.20 and 12,794.52

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Solution

The fourth proportional to 21,178.20, 29,221.20 and 12,794.52 is: 17,653.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,178.20 : 29,221.20 = 12,794.52 : x
  2. Step 2: Convert to fraction form
    21,178.20/29,221.20 = 12,794.52/x
  3. Step 3: Cross multiply
    21,178.20x = 29,221.20 × 12,794.52
  4. Step 4: Simplify right side
    21,178.20x = 373,871,227.82
  5. Step 5: Solve for x
    x = 373,871,227.82/21,178.20
  6. Step 6: Final answer
    x = 17,653.59

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Double scale
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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.