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Finding the Fourth Proportional to 312.93, 469.55 and 139.85

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Solution

The fourth proportional to 312.93, 469.55 and 139.85 is: 209.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.93 : 469.55 = 139.85 : x
  2. Step 2: Convert to fraction form
    312.93/469.55 = 139.85/x
  3. Step 3: Cross multiply
    312.93x = 469.55 × 139.85
  4. Step 4: Simplify right side
    312.93x = 65,663.52
  5. Step 5: Solve for x
    x = 65,663.52/312.93
  6. Step 6: Final answer
    x = 209.83

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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.