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Finding the Fourth Proportional to 883.14, 1,218.78 and 661.68

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Solution

The fourth proportional to 883.14, 1,218.78 and 661.68 is: 913.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    883.14 : 1,218.78 = 661.68 : x
  2. Step 2: Convert to fraction form
    883.14/1,218.78 = 661.68/x
  3. Step 3: Cross multiply
    883.14x = 1,218.78 × 661.68
  4. Step 4: Simplify right side
    883.14x = 806,442.35
  5. Step 5: Solve for x
    x = 806,442.35/883.14
  6. Step 6: Final answer
    x = 913.15

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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.