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Finding the Fourth Proportional to 553.79, 763.88 and 411.87

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Solution

The fourth proportional to 553.79, 763.88 and 411.87 is: 568.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.79 : 763.88 = 411.87 : x
  2. Step 2: Convert to fraction form
    553.79/763.88 = 411.87/x
  3. Step 3: Cross multiply
    553.79x = 763.88 × 411.87
  4. Step 4: Simplify right side
    553.79x = 314,617.20
  5. Step 5: Solve for x
    x = 314,617.20/553.79
  6. Step 6: Final answer
    x = 568.12

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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.