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Finding the Fourth Proportional to 553.08, 763.20 and 316.99

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Solution

The fourth proportional to 553.08, 763.20 and 316.99 is: 437.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.08 : 763.20 = 316.99 : x
  2. Step 2: Convert to fraction form
    553.08/763.20 = 316.99/x
  3. Step 3: Cross multiply
    553.08x = 763.20 × 316.99
  4. Step 4: Simplify right side
    553.08x = 241,926.77
  5. Step 5: Solve for x
    x = 241,926.77/553.08
  6. Step 6: Final answer
    x = 437.42

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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.