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Finding the Fourth Proportional to 4,656.80, 6,985.20 and 2,685.80

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Solution

The fourth proportional to 4,656.80, 6,985.20 and 2,685.80 is: 4,028.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,656.80 : 6,985.20 = 2,685.80 : x
  2. Step 2: Convert to fraction form
    4,656.80/6,985.20 = 2,685.80/x
  3. Step 3: Cross multiply
    4,656.80x = 6,985.20 × 2,685.80
  4. Step 4: Simplify right side
    4,656.80x = 18,760,850.16
  5. Step 5: Solve for x
    x = 18,760,850.16/4,656.80
  6. Step 6: Final answer
    x = 4,028.70

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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.