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Finding the Fourth Proportional to 370.28, 555.44 and 139.12

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Solution

The fourth proportional to 370.28, 555.44 and 139.12 is: 208.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.28 : 555.44 = 139.12 : x
  2. Step 2: Convert to fraction form
    370.28/555.44 = 139.12/x
  3. Step 3: Cross multiply
    370.28x = 555.44 × 139.12
  4. Step 4: Simplify right side
    370.28x = 77,272.81
  5. Step 5: Solve for x
    x = 77,272.81/370.28
  6. Step 6: Final answer
    x = 208.69

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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.