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Finding the Fourth Proportional to 213.04, 294 and 139.20

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Solution

The fourth proportional to 213.04, 294 and 139.20 is: 192.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.04 : 294 = 139.20 : x
  2. Step 2: Convert to fraction form
    213.04/294 = 139.20/x
  3. Step 3: Cross multiply
    213.04x = 294 × 139.20
  4. Step 4: Simplify right side
    213.04x = 40,924.80
  5. Step 5: Solve for x
    x = 40,924.80/213.04
  6. Step 6: Final answer
    x = 192.10

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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.