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Finding the Fourth Proportional to 8,698.72, 11,997.84 and 5,159.20

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Solution

The fourth proportional to 8,698.72, 11,997.84 and 5,159.20 is: 7,115.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,698.72 : 11,997.84 = 5,159.20 : x
  2. Step 2: Convert to fraction form
    8,698.72/11,997.84 = 5,159.20/x
  3. Step 3: Cross multiply
    8,698.72x = 11,997.84 × 5,159.20
  4. Step 4: Simplify right side
    8,698.72x = 61,899,256.13
  5. Step 5: Solve for x
    x = 61,899,256.13/8,698.72
  6. Step 6: Final answer
    x = 7,115.90

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1.5x scale

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.