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Finding the Fourth Proportional to 312.54, 468.80 and 93.15

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Solution

The fourth proportional to 312.54, 468.80 and 93.15 is: 139.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.54 : 468.80 = 93.15 : x
  2. Step 2: Convert to fraction form
    312.54/468.80 = 93.15/x
  3. Step 3: Cross multiply
    312.54x = 468.80 × 93.15
  4. Step 4: Simplify right side
    312.54x = 43,668.25
  5. Step 5: Solve for x
    x = 43,668.25/312.54
  6. Step 6: Final answer
    x = 139.72

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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.