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Finding the Fourth Proportional to 15,809.92, 21,801.36 and 13,579.20

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Solution

The fourth proportional to 15,809.92, 21,801.36 and 13,579.20 is: 18,725.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,809.92 : 21,801.36 = 13,579.20 : x
  2. Step 2: Convert to fraction form
    15,809.92/21,801.36 = 13,579.20/x
  3. Step 3: Cross multiply
    15,809.92x = 21,801.36 × 13,579.20
  4. Step 4: Simplify right side
    15,809.92x = 296,045,027.71
  5. Step 5: Solve for x
    x = 296,045,027.71/15,809.92
  6. Step 6: Final answer
    x = 18,725.27

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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.