Home / 21,273.28-29,360.39-12,780.12

Finding the Fourth Proportional to 21,273.28, 29,360.39 and 12,780.12

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Solution

The fourth proportional to 21,273.28, 29,360.39 and 12,780.12 is: 17,638.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,273.28 : 29,360.39 = 12,780.12 : x
  2. Step 2: Convert to fraction form
    21,273.28/29,360.39 = 12,780.12/x
  3. Step 3: Cross multiply
    21,273.28x = 29,360.39 × 12,780.12
  4. Step 4: Simplify right side
    21,273.28x = 375,229,307.45
  5. Step 5: Solve for x
    x = 375,229,307.45/21,273.28
  6. Step 6: Final answer
    x = 17,638.53

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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.