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Finding the Fourth Proportional to 553.50, 763.90 and 320.63

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Solution

The fourth proportional to 553.50, 763.90 and 320.63 is: 442.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.50 : 763.90 = 320.63 : x
  2. Step 2: Convert to fraction form
    553.50/763.90 = 320.63/x
  3. Step 3: Cross multiply
    553.50x = 763.90 × 320.63
  4. Step 4: Simplify right side
    553.50x = 244,924.64
  5. Step 5: Solve for x
    x = 244,924.64/553.50
  6. Step 6: Final answer
    x = 442.50

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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.