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Finding the Fourth Proportional to 726.84, 1,089.64 and 316.28

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Solution

The fourth proportional to 726.84, 1,089.64 and 316.28 is: 474.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.84 : 1,089.64 = 316.28 : x
  2. Step 2: Convert to fraction form
    726.84/1,089.64 = 316.28/x
  3. Step 3: Cross multiply
    726.84x = 1,089.64 × 316.28
  4. Step 4: Simplify right side
    726.84x = 344,631.34
  5. Step 5: Solve for x
    x = 344,631.34/726.84
  6. Step 6: Final answer
    x = 474.15

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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.