Home / 21,156.78-29,183.16-13,612.95

Finding the Fourth Proportional to 21,156.78, 29,183.16 and 13,612.95

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Solution

The fourth proportional to 21,156.78, 29,183.16 and 13,612.95 is: 18,777.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,156.78 : 29,183.16 = 13,612.95 : x
  2. Step 2: Convert to fraction form
    21,156.78/29,183.16 = 13,612.95/x
  3. Step 3: Cross multiply
    21,156.78x = 29,183.16 × 13,612.95
  4. Step 4: Simplify right side
    21,156.78x = 397,268,897.92
  5. Step 5: Solve for x
    x = 397,268,897.92/21,156.78
  6. Step 6: Final answer
    x = 18,777.38

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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.