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Finding the Fourth Proportional to 1,208.71, 1,812.46 and 661.35

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Solution

The fourth proportional to 1,208.71, 1,812.46 and 661.35 is: 991.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.71 : 1,812.46 = 661.35 : x
  2. Step 2: Convert to fraction form
    1,208.71/1,812.46 = 661.35/x
  3. Step 3: Cross multiply
    1,208.71x = 1,812.46 × 661.35
  4. Step 4: Simplify right side
    1,208.71x = 1,198,670.42
  5. Step 5: Solve for x
    x = 1,198,670.42/1,208.71
  6. Step 6: Final answer
    x = 991.69

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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.