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Finding the Fourth Proportional to 355.93, 534.12 and 139.50

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Solution

The fourth proportional to 355.93, 534.12 and 139.50 is: 209.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.93 : 534.12 = 139.50 : x
  2. Step 2: Convert to fraction form
    355.93/534.12 = 139.50/x
  3. Step 3: Cross multiply
    355.93x = 534.12 × 139.50
  4. Step 4: Simplify right side
    355.93x = 74,509.22
  5. Step 5: Solve for x
    x = 74,509.22/355.93
  6. Step 6: Final answer
    x = 209.34

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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.