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Finding the Fourth Proportional to 355.40, 529.82 and 347.21

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Solution

The fourth proportional to 355.40, 529.82 and 347.21 is: 517.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.40 : 529.82 = 347.21 : x
  2. Step 2: Convert to fraction form
    355.40/529.82 = 347.21/x
  3. Step 3: Cross multiply
    355.40x = 529.82 × 347.21
  4. Step 4: Simplify right side
    355.40x = 183,957.02
  5. Step 5: Solve for x
    x = 183,957.02/355.40
  6. Step 6: Final answer
    x = 517.61

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.