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Finding the Fourth Proportional to 28,376.63, 42,571.24 and 8,656.71

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Solution

The fourth proportional to 28,376.63, 42,571.24 and 8,656.71 is: 12,986.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,376.63 : 42,571.24 = 8,656.71 : x
  2. Step 2: Convert to fraction form
    28,376.63/42,571.24 = 8,656.71/x
  3. Step 3: Cross multiply
    28,376.63x = 42,571.24 × 8,656.71
  4. Step 4: Simplify right side
    28,376.63x = 368,526,697.74
  5. Step 5: Solve for x
    x = 368,526,697.74/28,376.63
  6. Step 6: Final answer
    x = 12,986.98

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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.