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Finding the Fourth Proportional to 312.66, 469.02 and 139.23

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Solution

The fourth proportional to 312.66, 469.02 and 139.23 is: 208.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.66 : 469.02 = 139.23 : x
  2. Step 2: Convert to fraction form
    312.66/469.02 = 139.23/x
  3. Step 3: Cross multiply
    312.66x = 469.02 × 139.23
  4. Step 4: Simplify right side
    312.66x = 65,301.65
  5. Step 5: Solve for x
    x = 65,301.65/312.66
  6. Step 6: Final answer
    x = 208.86

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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.