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Finding the Fourth Proportional to 8,686.80, 11,987.28 and 4,960.80

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Solution

The fourth proportional to 8,686.80, 11,987.28 and 4,960.80 is: 6,845.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,686.80 : 11,987.28 = 4,960.80 : x
  2. Step 2: Convert to fraction form
    8,686.80/11,987.28 = 4,960.80/x
  3. Step 3: Cross multiply
    8,686.80x = 11,987.28 × 4,960.80
  4. Step 4: Simplify right side
    8,686.80x = 59,466,498.62
  5. Step 5: Solve for x
    x = 59,466,498.62/8,686.80
  6. Step 6: Final answer
    x = 6,845.62

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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.