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Finding the Fourth Proportional to 2,656.80, 3,985.40 and 808.07

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Solution

The fourth proportional to 2,656.80, 3,985.40 and 808.07 is: 1,212.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,656.80 : 3,985.40 = 808.07 : x
  2. Step 2: Convert to fraction form
    2,656.80/3,985.40 = 808.07/x
  3. Step 3: Cross multiply
    2,656.80x = 3,985.40 × 808.07
  4. Step 4: Simplify right side
    2,656.80x = 3,220,464.27
  5. Step 5: Solve for x
    x = 3,220,464.27/2,656.80
  6. Step 6: Final answer
    x = 1,212.16

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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.