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Finding the Fourth Proportional to 312.60, 469.08 and 139.38

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Solution

The fourth proportional to 312.60, 469.08 and 139.38 is: 209.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.60 : 469.08 = 139.38 : x
  2. Step 2: Convert to fraction form
    312.60/469.08 = 139.38/x
  3. Step 3: Cross multiply
    312.60x = 469.08 × 139.38
  4. Step 4: Simplify right side
    312.60x = 65,380.37
  5. Step 5: Solve for x
    x = 65,380.37/312.60
  6. Step 6: Final answer
    x = 209.15

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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.