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Finding the Fourth Proportional to 355.98, 530.78 and 349.50

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Solution

The fourth proportional to 355.98, 530.78 and 349.50 is: 521.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.98 : 530.78 = 349.50 : x
  2. Step 2: Convert to fraction form
    355.98/530.78 = 349.50/x
  3. Step 3: Cross multiply
    355.98x = 530.78 × 349.50
  4. Step 4: Simplify right side
    355.98x = 185,507.61
  5. Step 5: Solve for x
    x = 185,507.61/355.98
  6. Step 6: Final answer
    x = 521.12

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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.