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Finding the Fourth Proportional to 312.61, 468.78 and 139.33

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Solution

The fourth proportional to 312.61, 468.78 and 139.33 is: 208.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.61 : 468.78 = 139.33 : x
  2. Step 2: Convert to fraction form
    312.61/468.78 = 139.33/x
  3. Step 3: Cross multiply
    312.61x = 468.78 × 139.33
  4. Step 4: Simplify right side
    312.61x = 65,315.12
  5. Step 5: Solve for x
    x = 65,315.12/312.61
  6. Step 6: Final answer
    x = 208.93

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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.