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Finding the Fourth Proportional to 8,978.81, 13,470.96 and 3,135.92

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Solution

The fourth proportional to 8,978.81, 13,470.96 and 3,135.92 is: 4,704.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.81 : 13,470.96 = 3,135.92 : x
  2. Step 2: Convert to fraction form
    8,978.81/13,470.96 = 3,135.92/x
  3. Step 3: Cross multiply
    8,978.81x = 13,470.96 × 3,135.92
  4. Step 4: Simplify right side
    8,978.81x = 42,243,852.88
  5. Step 5: Solve for x
    x = 42,243,852.88/8,978.81
  6. Step 6: Final answer
    x = 4,704.84

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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.