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Finding the Fourth Proportional to 857.79, 1,181.66 and 661.23

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Solution

The fourth proportional to 857.79, 1,181.66 and 661.23 is: 910.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    857.79 : 1,181.66 = 661.23 : x
  2. Step 2: Convert to fraction form
    857.79/1,181.66 = 661.23/x
  3. Step 3: Cross multiply
    857.79x = 1,181.66 × 661.23
  4. Step 4: Simplify right side
    857.79x = 781,345.74
  5. Step 5: Solve for x
    x = 781,345.74/857.79
  6. Step 6: Final answer
    x = 910.88

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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.