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Finding the Fourth Proportional to 28,291.71, 42,437.81 and 8,571.81

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Solution

The fourth proportional to 28,291.71, 42,437.81 and 8,571.81 is: 12,857.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,291.71 : 42,437.81 = 8,571.81 : x
  2. Step 2: Convert to fraction form
    28,291.71/42,437.81 = 8,571.81/x
  3. Step 3: Cross multiply
    28,291.71x = 42,437.81 × 8,571.81
  4. Step 4: Simplify right side
    28,291.71x = 363,768,801.28
  5. Step 5: Solve for x
    x = 363,768,801.28/28,291.71
  6. Step 6: Final answer
    x = 12,857.79

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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.