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Finding the Fourth Proportional to 213.15, 294.40 and 139.80

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Solution

The fourth proportional to 213.15, 294.40 and 139.80 is: 193.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.15 : 294.40 = 139.80 : x
  2. Step 2: Convert to fraction form
    213.15/294.40 = 139.80/x
  3. Step 3: Cross multiply
    213.15x = 294.40 × 139.80
  4. Step 4: Simplify right side
    213.15x = 41,155.67
  5. Step 5: Solve for x
    x = 41,155.67/213.15
  6. Step 6: Final answer
    x = 193.08

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.