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Finding the Fourth Proportional to 15,725.44, 21,720 and 13,655.44

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Solution

The fourth proportional to 15,725.44, 21,720 and 13,655.44 is: 18,860.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,725.44 : 21,720 = 13,655.44 : x
  2. Step 2: Convert to fraction form
    15,725.44/21,720 = 13,655.44/x
  3. Step 3: Cross multiply
    15,725.44x = 21,720 × 13,655.44
  4. Step 4: Simplify right side
    15,725.44x = 296,596,156.80
  5. Step 5: Solve for x
    x = 296,596,156.80/15,725.44
  6. Step 6: Final answer
    x = 18,860.91

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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.