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Finding the Fourth Proportional to 28,291.56, 42,437.34 and 8,572.11

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Solution

The fourth proportional to 28,291.56, 42,437.34 and 8,572.11 is: 12,858.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,291.56 : 42,437.34 = 8,572.11 : x
  2. Step 2: Convert to fraction form
    28,291.56/42,437.34 = 8,572.11/x
  3. Step 3: Cross multiply
    28,291.56x = 42,437.34 × 8,572.11
  4. Step 4: Simplify right side
    28,291.56x = 363,777,546.59
  5. Step 5: Solve for x
    x = 363,777,546.59/28,291.56
  6. Step 6: Final answer
    x = 12,858.17

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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.