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Finding the Fourth Proportional to 553.19, 763.50 and 387.65

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Solution

The fourth proportional to 553.19, 763.50 and 387.65 is: 535.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    553.19 : 763.50 = 387.65 : x
  2. Step 2: Convert to fraction form
    553.19/763.50 = 387.65/x
  3. Step 3: Cross multiply
    553.19x = 763.50 × 387.65
  4. Step 4: Simplify right side
    553.19x = 295,968.87
  5. Step 5: Solve for x
    x = 295,968.87/553.19
  6. Step 6: Final answer
    x = 535.02

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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.