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Finding the Fourth Proportional to 310.20, 465.21 and 117.78

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Solution

The fourth proportional to 310.20, 465.21 and 117.78 is: 176.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.20 : 465.21 = 117.78 : x
  2. Step 2: Convert to fraction form
    310.20/465.21 = 117.78/x
  3. Step 3: Cross multiply
    310.20x = 465.21 × 117.78
  4. Step 4: Simplify right side
    310.20x = 54,792.43
  5. Step 5: Solve for x
    x = 54,792.43/310.20
  6. Step 6: Final answer
    x = 176.64

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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.