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Finding the Fourth Proportional to 284.64, 392.94 and 217.70

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Solution

The fourth proportional to 284.64, 392.94 and 217.70 is: 300.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.64 : 392.94 = 217.70 : x
  2. Step 2: Convert to fraction form
    284.64/392.94 = 217.70/x
  3. Step 3: Cross multiply
    284.64x = 392.94 × 217.70
  4. Step 4: Simplify right side
    284.64x = 85,543.04
  5. Step 5: Solve for x
    x = 85,543.04/284.64
  6. Step 6: Final answer
    x = 300.53

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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.