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Finding the Fourth Proportional to 8,616.72, 12,899.57 and 5,319.21

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Solution

The fourth proportional to 8,616.72, 12,899.57 and 5,319.21 is: 7,963.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,616.72 : 12,899.57 = 5,319.21 : x
  2. Step 2: Convert to fraction form
    8,616.72/12,899.57 = 5,319.21/x
  3. Step 3: Cross multiply
    8,616.72x = 12,899.57 × 5,319.21
  4. Step 4: Simplify right side
    8,616.72x = 68,615,495.14
  5. Step 5: Solve for x
    x = 68,615,495.14/8,616.72
  6. Step 6: Final answer
    x = 7,963.06

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1.5x scale

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.