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Finding the Fourth Proportional to 415.14, 619.19 and 407.85

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Solution

The fourth proportional to 415.14, 619.19 and 407.85 is: 608.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    415.14 : 619.19 = 407.85 : x
  2. Step 2: Convert to fraction form
    415.14/619.19 = 407.85/x
  3. Step 3: Cross multiply
    415.14x = 619.19 × 407.85
  4. Step 4: Simplify right side
    415.14x = 252,534.60
  5. Step 5: Solve for x
    x = 252,534.60/415.14
  6. Step 6: Final answer
    x = 608.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.