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Finding the Fourth Proportional to 315.68, 435.58 and 217.40

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Solution

The fourth proportional to 315.68, 435.58 and 217.40 is: 299.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.68 : 435.58 = 217.40 : x
  2. Step 2: Convert to fraction form
    315.68/435.58 = 217.40/x
  3. Step 3: Cross multiply
    315.68x = 435.58 × 217.40
  4. Step 4: Simplify right side
    315.68x = 94,695.09
  5. Step 5: Solve for x
    x = 94,695.09/315.68
  6. Step 6: Final answer
    x = 299.97

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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.