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Finding the Fourth Proportional to 355.60, 533 and 139.08

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Solution

The fourth proportional to 355.60, 533 and 139.08 is: 208.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    355.60 : 533 = 139.08 : x
  2. Step 2: Convert to fraction form
    355.60/533 = 139.08/x
  3. Step 3: Cross multiply
    355.60x = 533 × 139.08
  4. Step 4: Simplify right side
    355.60x = 74,129.64
  5. Step 5: Solve for x
    x = 74,129.64/355.60
  6. Step 6: Final answer
    x = 208.46

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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.