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Finding the Fourth Proportional to 369.90, 555.21 and 139.02

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Solution

The fourth proportional to 369.90, 555.21 and 139.02 is: 208.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.90 : 555.21 = 139.02 : x
  2. Step 2: Convert to fraction form
    369.90/555.21 = 139.02/x
  3. Step 3: Cross multiply
    369.90x = 555.21 × 139.02
  4. Step 4: Simplify right side
    369.90x = 77,185.29
  5. Step 5: Solve for x
    x = 77,185.29/369.90
  6. Step 6: Final answer
    x = 208.67

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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.