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Finding the Fourth Proportional to 1,020.79, 1,409.04 and 726.91

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Solution

The fourth proportional to 1,020.79, 1,409.04 and 726.91 is: 1,003.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,020.79 : 1,409.04 = 726.91 : x
  2. Step 2: Convert to fraction form
    1,020.79/1,409.04 = 726.91/x
  3. Step 3: Cross multiply
    1,020.79x = 1,409.04 × 726.91
  4. Step 4: Simplify right side
    1,020.79x = 1,024,245.27
  5. Step 5: Solve for x
    x = 1,024,245.27/1,020.79
  6. Step 6: Final answer
    x = 1,003.38

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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.