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Finding the Fourth Proportional to 355, 489.45 and 291.75

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Solution

The fourth proportional to 355, 489.45 and 291.75 is: 402.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    355 : 489.45 = 291.75 : x
  2. Step 2: Convert to fraction form
    355/489.45 = 291.75/x
  3. Step 3: Cross multiply
    355x = 489.45 × 291.75
  4. Step 4: Simplify right side
    355x = 142,797.04
  5. Step 5: Solve for x
    x = 142,797.04/355
  6. Step 6: Final answer
    x = 402.25

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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.