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Finding the Fourth Proportional to 8,636.88, 11,920.04 and 6,405.12

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Solution

The fourth proportional to 8,636.88, 11,920.04 and 6,405.12 is: 8,839.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,636.88 : 11,920.04 = 6,405.12 : x
  2. Step 2: Convert to fraction form
    8,636.88/11,920.04 = 6,405.12/x
  3. Step 3: Cross multiply
    8,636.88x = 11,920.04 × 6,405.12
  4. Step 4: Simplify right side
    8,636.88x = 76,349,254.58
  5. Step 5: Solve for x
    x = 76,349,254.58/8,636.88
  6. Step 6: Final answer
    x = 8,839.91

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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.