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Finding the Fourth Proportional to 28,078.77, 38,748.11 and 18,507.09

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Solution

The fourth proportional to 28,078.77, 38,748.11 and 18,507.09 is: 25,539.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,078.77 : 38,748.11 = 18,507.09 : x
  2. Step 2: Convert to fraction form
    28,078.77/38,748.11 = 18,507.09/x
  3. Step 3: Cross multiply
    28,078.77x = 38,748.11 × 18,507.09
  4. Step 4: Simplify right side
    28,078.77x = 717,114,666.56
  5. Step 5: Solve for x
    x = 717,114,666.56/28,078.77
  6. Step 6: Final answer
    x = 25,539.39

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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.