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Finding the Fourth Proportional to 355.06, 489.78 and 347.80

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Solution

The fourth proportional to 355.06, 489.78 and 347.80 is: 479.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.06 : 489.78 = 347.80 : x
  2. Step 2: Convert to fraction form
    355.06/489.78 = 347.80/x
  3. Step 3: Cross multiply
    355.06x = 489.78 × 347.80
  4. Step 4: Simplify right side
    355.06x = 170,345.48
  5. Step 5: Solve for x
    x = 170,345.48/355.06
  6. Step 6: Final answer
    x = 479.77

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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.