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Finding the Fourth Proportional to 370.31, 555.29 and 139.19

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Solution

The fourth proportional to 370.31, 555.29 and 139.19 is: 208.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.31 : 555.29 = 139.19 : x
  2. Step 2: Convert to fraction form
    370.31/555.29 = 139.19/x
  3. Step 3: Cross multiply
    370.31x = 555.29 × 139.19
  4. Step 4: Simplify right side
    370.31x = 77,290.82
  5. Step 5: Solve for x
    x = 77,290.82/370.31
  6. Step 6: Final answer
    x = 208.72

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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.