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Finding the Fourth Proportional to 415.69, 623.71 and 141.80

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Solution

The fourth proportional to 415.69, 623.71 and 141.80 is: 212.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.69 : 623.71 = 141.80 : x
  2. Step 2: Convert to fraction form
    415.69/623.71 = 141.80/x
  3. Step 3: Cross multiply
    415.69x = 623.71 × 141.80
  4. Step 4: Simplify right side
    415.69x = 88,442.25
  5. Step 5: Solve for x
    x = 88,442.25/415.69
  6. Step 6: Final answer
    x = 212.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.