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Finding the Fourth Proportional to 370.72, 555.97 and 139.70

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Solution

The fourth proportional to 370.72, 555.97 and 139.70 is: 209.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    370.72 : 555.97 = 139.70 : x
  2. Step 2: Convert to fraction form
    370.72/555.97 = 139.70/x
  3. Step 3: Cross multiply
    370.72x = 555.97 × 139.70
  4. Step 4: Simplify right side
    370.72x = 77,669.01
  5. Step 5: Solve for x
    x = 77,669.01/370.72
  6. Step 6: Final answer
    x = 209.51

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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.