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Finding the Fourth Proportional to 553.55, 763.92 and 317.53

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Solution

The fourth proportional to 553.55, 763.92 and 317.53 is: 438.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.55 : 763.92 = 317.53 : x
  2. Step 2: Convert to fraction form
    553.55/763.92 = 317.53/x
  3. Step 3: Cross multiply
    553.55x = 763.92 × 317.53
  4. Step 4: Simplify right side
    553.55x = 242,568.47
  5. Step 5: Solve for x
    x = 242,568.47/553.55
  6. Step 6: Final answer
    x = 438.21

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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.