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Finding the Fourth Proportional to 553.60, 763.96 and 320.72

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Solution

The fourth proportional to 553.60, 763.96 and 320.72 is: 442.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.60 : 763.96 = 320.72 : x
  2. Step 2: Convert to fraction form
    553.60/763.96 = 320.72/x
  3. Step 3: Cross multiply
    553.60x = 763.96 × 320.72
  4. Step 4: Simplify right side
    553.60x = 245,017.25
  5. Step 5: Solve for x
    x = 245,017.25/553.60
  6. Step 6: Final answer
    x = 442.59

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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.