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Finding the Fourth Proportional to 726.78, 1,090.48 and 315.84

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Solution

The fourth proportional to 726.78, 1,090.48 and 315.84 is: 473.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.78 : 1,090.48 = 315.84 : x
  2. Step 2: Convert to fraction form
    726.78/1,090.48 = 315.84/x
  3. Step 3: Cross multiply
    726.78x = 1,090.48 × 315.84
  4. Step 4: Simplify right side
    726.78x = 344,417.20
  5. Step 5: Solve for x
    x = 344,417.20/726.78
  6. Step 6: Final answer
    x = 473.89

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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.