Home / 21,279.71-29,334.49-13,621.86

Finding the Fourth Proportional to 21,279.71, 29,334.49 and 13,621.86

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Solution

The fourth proportional to 21,279.71, 29,334.49 and 13,621.86 is: 18,777.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.71 : 29,334.49 = 13,621.86 : x
  2. Step 2: Convert to fraction form
    21,279.71/29,334.49 = 13,621.86/x
  3. Step 3: Cross multiply
    21,279.71x = 29,334.49 × 13,621.86
  4. Step 4: Simplify right side
    21,279.71x = 399,590,101.17
  5. Step 5: Solve for x
    x = 399,590,101.17/21,279.71
  6. Step 6: Final answer
    x = 18,777.99

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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.