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Finding the Fourth Proportional to 28,500, 42,753.42 and 11,871.30

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Solution

The fourth proportional to 28,500, 42,753.42 and 11,871.30 is: 17,808.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,500 : 42,753.42 = 11,871.30 : x
  2. Step 2: Convert to fraction form
    28,500/42,753.42 = 11,871.30/x
  3. Step 3: Cross multiply
    28,500x = 42,753.42 × 11,871.30
  4. Step 4: Simplify right side
    28,500x = 507,538,674.85
  5. Step 5: Solve for x
    x = 507,538,674.85/28,500
  6. Step 6: Final answer
    x = 17,808.37

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.