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Finding the Fourth Proportional to 726.96, 1,091.40 and 572.40

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Solution

The fourth proportional to 726.96, 1,091.40 and 572.40 is: 859.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.96 : 1,091.40 = 572.40 : x
  2. Step 2: Convert to fraction form
    726.96/1,091.40 = 572.40/x
  3. Step 3: Cross multiply
    726.96x = 1,091.40 × 572.40
  4. Step 4: Simplify right side
    726.96x = 624,717.36
  5. Step 5: Solve for x
    x = 624,717.36/726.96
  6. Step 6: Final answer
    x = 859.36

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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.