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Finding the Fourth Proportional to 553.53, 763.91 and 320.66

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Solution

The fourth proportional to 553.53, 763.91 and 320.66 is: 442.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.53 : 763.91 = 320.66 : x
  2. Step 2: Convert to fraction form
    553.53/763.91 = 320.66/x
  3. Step 3: Cross multiply
    553.53x = 763.91 × 320.66
  4. Step 4: Simplify right side
    553.53x = 244,955.83
  5. Step 5: Solve for x
    x = 244,955.83/553.53
  6. Step 6: Final answer
    x = 442.53

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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.