Home / 21,028.78-29,021.76-15,714.40

Finding the Fourth Proportional to 21,028.78, 29,021.76 and 15,714.40

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Solution

The fourth proportional to 21,028.78, 29,021.76 and 15,714.40 is: 21,687.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,028.78 : 29,021.76 = 15,714.40 : x
  2. Step 2: Convert to fraction form
    21,028.78/29,021.76 = 15,714.40/x
  3. Step 3: Cross multiply
    21,028.78x = 29,021.76 × 15,714.40
  4. Step 4: Simplify right side
    21,028.78x = 456,059,545.34
  5. Step 5: Solve for x
    x = 456,059,545.34/21,028.78
  6. Step 6: Final answer
    x = 21,687.40

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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.