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Finding the Fourth Proportional to 725.51, 1,086.92 and 647.69

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Solution

The fourth proportional to 725.51, 1,086.92 and 647.69 is: 970.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    725.51 : 1,086.92 = 647.69 : x
  2. Step 2: Convert to fraction form
    725.51/1,086.92 = 647.69/x
  3. Step 3: Cross multiply
    725.51x = 1,086.92 × 647.69
  4. Step 4: Simplify right side
    725.51x = 703,986.69
  5. Step 5: Solve for x
    x = 703,986.69/725.51
  6. Step 6: Final answer
    x = 970.34

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1.5x scale

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.