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Finding the Fourth Proportional to 8,279.64, 12,400.32 and 4,985.48

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Solution

The fourth proportional to 8,279.64, 12,400.32 and 4,985.48 is: 7,466.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,279.64 : 12,400.32 = 4,985.48 : x
  2. Step 2: Convert to fraction form
    8,279.64/12,400.32 = 4,985.48/x
  3. Step 3: Cross multiply
    8,279.64x = 12,400.32 × 4,985.48
  4. Step 4: Simplify right side
    8,279.64x = 61,821,485.35
  5. Step 5: Solve for x
    x = 61,821,485.35/8,279.64
  6. Step 6: Final answer
    x = 7,466.69

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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.