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Finding the Fourth Proportional to 726.45, 1,090.70 and 479.70

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Solution

The fourth proportional to 726.45, 1,090.70 and 479.70 is: 720.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.45 : 1,090.70 = 479.70 : x
  2. Step 2: Convert to fraction form
    726.45/1,090.70 = 479.70/x
  3. Step 3: Cross multiply
    726.45x = 1,090.70 × 479.70
  4. Step 4: Simplify right side
    726.45x = 523,206.39
  5. Step 5: Solve for x
    x = 523,206.39/726.45
  6. Step 6: Final answer
    x = 720.22

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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.