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Finding the Fourth Proportional to 726.40, 1,086.90 and 483.40

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Solution

The fourth proportional to 726.40, 1,086.90 and 483.40 is: 723.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.40 : 1,086.90 = 483.40 : x
  2. Step 2: Convert to fraction form
    726.40/1,086.90 = 483.40/x
  3. Step 3: Cross multiply
    726.40x = 1,086.90 × 483.40
  4. Step 4: Simplify right side
    726.40x = 525,407.46
  5. Step 5: Solve for x
    x = 525,407.46/726.40
  6. Step 6: Final answer
    x = 723.30

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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.