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Finding the Fourth Proportional to 8,418.88, 11,615.04 and 5,015.20

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Solution

The fourth proportional to 8,418.88, 11,615.04 and 5,015.20 is: 6,919.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,418.88 : 11,615.04 = 5,015.20 : x
  2. Step 2: Convert to fraction form
    8,418.88/11,615.04 = 5,015.20/x
  3. Step 3: Cross multiply
    8,418.88x = 11,615.04 × 5,015.20
  4. Step 4: Simplify right side
    8,418.88x = 58,251,748.61
  5. Step 5: Solve for x
    x = 58,251,748.61/8,418.88
  6. Step 6: Final answer
    x = 6,919.18

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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.