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Finding the Fourth Proportional to 370.39, 555.40 and 139.24

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Solution

The fourth proportional to 370.39, 555.40 and 139.24 is: 208.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.39 : 555.40 = 139.24 : x
  2. Step 2: Convert to fraction form
    370.39/555.40 = 139.24/x
  3. Step 3: Cross multiply
    370.39x = 555.40 × 139.24
  4. Step 4: Simplify right side
    370.39x = 77,333.90
  5. Step 5: Solve for x
    x = 77,333.90/370.39
  6. Step 6: Final answer
    x = 208.79

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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.