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Finding the Fourth Proportional to 312.59, 468.79 and 93.20

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Solution

The fourth proportional to 312.59, 468.79 and 93.20 is: 139.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    312.59 : 468.79 = 93.20 : x
  2. Step 2: Convert to fraction form
    312.59/468.79 = 93.20/x
  3. Step 3: Cross multiply
    312.59x = 468.79 × 93.20
  4. Step 4: Simplify right side
    312.59x = 43,692.17
  5. Step 5: Solve for x
    x = 43,692.17/312.59
  6. Step 6: Final answer
    x = 139.78

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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.