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Finding the Fourth Proportional to 355.95, 534.16 and 139.53

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Solution

The fourth proportional to 355.95, 534.16 and 139.53 is: 209.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.95 : 534.16 = 139.53 : x
  2. Step 2: Convert to fraction form
    355.95/534.16 = 139.53/x
  3. Step 3: Cross multiply
    355.95x = 534.16 × 139.53
  4. Step 4: Simplify right side
    355.95x = 74,531.34
  5. Step 5: Solve for x
    x = 74,531.34/355.95
  6. Step 6: Final answer
    x = 209.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.