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Finding the Fourth Proportional to 315.79, 435.63 and 217.60

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Solution

The fourth proportional to 315.79, 435.63 and 217.60 is: 300.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.79 : 435.63 = 217.60 : x
  2. Step 2: Convert to fraction form
    315.79/435.63 = 217.60/x
  3. Step 3: Cross multiply
    315.79x = 435.63 × 217.60
  4. Step 4: Simplify right side
    315.79x = 94,793.09
  5. Step 5: Solve for x
    x = 94,793.09/315.79
  6. Step 6: Final answer
    x = 300.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.