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Finding the Fourth Proportional to 312.99, 469.08 and 139.53

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Solution

The fourth proportional to 312.99, 469.08 and 139.53 is: 209.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.99 : 469.08 = 139.53 : x
  2. Step 2: Convert to fraction form
    312.99/469.08 = 139.53/x
  3. Step 3: Cross multiply
    312.99x = 469.08 × 139.53
  4. Step 4: Simplify right side
    312.99x = 65,450.73
  5. Step 5: Solve for x
    x = 65,450.73/312.99
  6. Step 6: Final answer
    x = 209.11

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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.