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Finding the Fourth Proportional to 713.86, 985.34 and 661.91

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Solution

The fourth proportional to 713.86, 985.34 and 661.91 is: 913.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    713.86 : 985.34 = 661.91 : x
  2. Step 2: Convert to fraction form
    713.86/985.34 = 661.91/x
  3. Step 3: Cross multiply
    713.86x = 985.34 × 661.91
  4. Step 4: Simplify right side
    713.86x = 652,205.55
  5. Step 5: Solve for x
    x = 652,205.55/713.86
  6. Step 6: Final answer
    x = 913.64

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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.