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Finding the Fourth Proportional to 284.69, 392.80 and 218.38

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Solution

The fourth proportional to 284.69, 392.80 and 218.38 is: 301.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.69 : 392.80 = 218.38 : x
  2. Step 2: Convert to fraction form
    284.69/392.80 = 218.38/x
  3. Step 3: Cross multiply
    284.69x = 392.80 × 218.38
  4. Step 4: Simplify right side
    284.69x = 85,779.66
  5. Step 5: Solve for x
    x = 85,779.66/284.69
  6. Step 6: Final answer
    x = 301.31

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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.