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Finding the Fourth Proportional to 393, 591.79 and 291.01

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Solution

The fourth proportional to 393, 591.79 and 291.01 is: 438.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    393 : 591.79 = 291.01 : x
  2. Step 2: Convert to fraction form
    393/591.79 = 291.01/x
  3. Step 3: Cross multiply
    393x = 591.79 × 291.01
  4. Step 4: Simplify right side
    393x = 172,215.69
  5. Step 5: Solve for x
    x = 172,215.69/393
  6. Step 6: Final answer
    x = 438.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.