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Finding the Fourth Proportional to 553.47, 763.79 and 317.46

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Solution

The fourth proportional to 553.47, 763.79 and 317.46 is: 438.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.47 : 763.79 = 317.46 : x
  2. Step 2: Convert to fraction form
    553.47/763.79 = 317.46/x
  3. Step 3: Cross multiply
    553.47x = 763.79 × 317.46
  4. Step 4: Simplify right side
    553.47x = 242,471.19
  5. Step 5: Solve for x
    x = 242,471.19/553.47
  6. Step 6: Final answer
    x = 438.09

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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.