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Finding the Fourth Proportional to 553.20, 763.36 and 317.12

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Solution

The fourth proportional to 553.20, 763.36 and 317.12 is: 437.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.20 : 763.36 = 317.12 : x
  2. Step 2: Convert to fraction form
    553.20/763.36 = 317.12/x
  3. Step 3: Cross multiply
    553.20x = 763.36 × 317.12
  4. Step 4: Simplify right side
    553.20x = 242,076.72
  5. Step 5: Solve for x
    x = 242,076.72/553.20
  6. Step 6: Final answer
    x = 437.59

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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.