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Finding the Fourth Proportional to 8,978.13, 12,376.98 and 6,317.28

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Solution

The fourth proportional to 8,978.13, 12,376.98 and 6,317.28 is: 8,708.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,978.13 : 12,376.98 = 6,317.28 : x
  2. Step 2: Convert to fraction form
    8,978.13/12,376.98 = 6,317.28/x
  3. Step 3: Cross multiply
    8,978.13x = 12,376.98 × 6,317.28
  4. Step 4: Simplify right side
    8,978.13x = 78,188,848.21
  5. Step 5: Solve for x
    x = 78,188,848.21/8,978.13
  6. Step 6: Final answer
    x = 8,708.81

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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.