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Finding the Fourth Proportional to 415.98, 624 and 127.38

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Solution

The fourth proportional to 415.98, 624 and 127.38 is: 191.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.98 : 624 = 127.38 : x
  2. Step 2: Convert to fraction form
    415.98/624 = 127.38/x
  3. Step 3: Cross multiply
    415.98x = 624 × 127.38
  4. Step 4: Simplify right side
    415.98x = 79,485.12
  5. Step 5: Solve for x
    x = 79,485.12/415.98
  6. Step 6: Final answer
    x = 191.08

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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.