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Finding the Fourth Proportional to 20,871.98, 28,841.53 and 15,196.88

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Solution

The fourth proportional to 20,871.98, 28,841.53 and 15,196.88 is: 20,999.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,871.98 : 28,841.53 = 15,196.88 : x
  2. Step 2: Convert to fraction form
    20,871.98/28,841.53 = 15,196.88/x
  3. Step 3: Cross multiply
    20,871.98x = 28,841.53 × 15,196.88
  4. Step 4: Simplify right side
    20,871.98x = 438,301,270.43
  5. Step 5: Solve for x
    x = 438,301,270.43/20,871.98
  6. Step 6: Final answer
    x = 20,999.51

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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.