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Finding the Fourth Proportional to 726.90, 1,004.04 and 685.86

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Solution

The fourth proportional to 726.90, 1,004.04 and 685.86 is: 947.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.90 : 1,004.04 = 685.86 : x
  2. Step 2: Convert to fraction form
    726.90/1,004.04 = 685.86/x
  3. Step 3: Cross multiply
    726.90x = 1,004.04 × 685.86
  4. Step 4: Simplify right side
    726.90x = 688,630.87
  5. Step 5: Solve for x
    x = 688,630.87/726.90
  6. Step 6: Final answer
    x = 947.35

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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.