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Finding the Fourth Proportional to 370.07, 555.11 and 138.91

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Solution

The fourth proportional to 370.07, 555.11 and 138.91 is: 208.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.07 : 555.11 = 138.91 : x
  2. Step 2: Convert to fraction form
    370.07/555.11 = 138.91/x
  3. Step 3: Cross multiply
    370.07x = 555.11 × 138.91
  4. Step 4: Simplify right side
    370.07x = 77,110.33
  5. Step 5: Solve for x
    x = 77,110.33/370.07
  6. Step 6: Final answer
    x = 208.37

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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.