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Finding the Fourth Proportional to 2,657.18, 3,985.54 and 808.71

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Solution

The fourth proportional to 2,657.18, 3,985.54 and 808.71 is: 1,212.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,657.18 : 3,985.54 = 808.71 : x
  2. Step 2: Convert to fraction form
    2,657.18/3,985.54 = 808.71/x
  3. Step 3: Cross multiply
    2,657.18x = 3,985.54 × 808.71
  4. Step 4: Simplify right side
    2,657.18x = 3,223,129.09
  5. Step 5: Solve for x
    x = 3,223,129.09/2,657.18
  6. Step 6: Final answer
    x = 1,212.99

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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.