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Finding the Fourth Proportional to 284.20, 392.18 and 159.85

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Solution

The fourth proportional to 284.20, 392.18 and 159.85 is: 220.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.20 : 392.18 = 159.85 : x
  2. Step 2: Convert to fraction form
    284.20/392.18 = 159.85/x
  3. Step 3: Cross multiply
    284.20x = 392.18 × 159.85
  4. Step 4: Simplify right side
    284.20x = 62,688.19
  5. Step 5: Solve for x
    x = 62,688.19/284.20
  6. Step 6: Final answer
    x = 220.58

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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.