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Finding the Fourth Proportional to 423.99, 635.99 and 388.76

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Solution

The fourth proportional to 423.99, 635.99 and 388.76 is: 583.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.99 : 635.99 = 388.76 : x
  2. Step 2: Convert to fraction form
    423.99/635.99 = 388.76/x
  3. Step 3: Cross multiply
    423.99x = 635.99 × 388.76
  4. Step 4: Simplify right side
    423.99x = 247,242.35
  5. Step 5: Solve for x
    x = 247,242.35/423.99
  6. Step 6: Final answer
    x = 583.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.