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Finding the Fourth Proportional to 20,459.89, 28,250.54 and 15,975.87

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Solution

The fourth proportional to 20,459.89, 28,250.54 and 15,975.87 is: 22,059.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,459.89 : 28,250.54 = 15,975.87 : x
  2. Step 2: Convert to fraction form
    20,459.89/28,250.54 = 15,975.87/x
  3. Step 3: Cross multiply
    20,459.89x = 28,250.54 × 15,975.87
  4. Step 4: Simplify right side
    20,459.89x = 451,326,733.34
  5. Step 5: Solve for x
    x = 451,326,733.34/20,459.89
  6. Step 6: Final answer
    x = 22,059.10

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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.