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Finding the Fourth Proportional to 704.79, 972.92 and 660.51

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Solution

The fourth proportional to 704.79, 972.92 and 660.51 is: 911.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    704.79 : 972.92 = 660.51 : x
  2. Step 2: Convert to fraction form
    704.79/972.92 = 660.51/x
  3. Step 3: Cross multiply
    704.79x = 972.92 × 660.51
  4. Step 4: Simplify right side
    704.79x = 642,620.09
  5. Step 5: Solve for x
    x = 642,620.09/704.79
  6. Step 6: Final answer
    x = 911.79

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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.