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Finding the Fourth Proportional to 355.62, 489.69 and 347.53

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Solution

The fourth proportional to 355.62, 489.69 and 347.53 is: 478.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.62 : 489.69 = 347.53 : x
  2. Step 2: Convert to fraction form
    355.62/489.69 = 347.53/x
  3. Step 3: Cross multiply
    355.62x = 489.69 × 347.53
  4. Step 4: Simplify right side
    355.62x = 170,181.97
  5. Step 5: Solve for x
    x = 170,181.97/355.62
  6. Step 6: Final answer
    x = 478.55

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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.