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Finding the Fourth Proportional to 613.18, 919.50 and 407.98

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Solution

The fourth proportional to 613.18, 919.50 and 407.98 is: 611.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.18 : 919.50 = 407.98 : x
  2. Step 2: Convert to fraction form
    613.18/919.50 = 407.98/x
  3. Step 3: Cross multiply
    613.18x = 919.50 × 407.98
  4. Step 4: Simplify right side
    613.18x = 375,137.61
  5. Step 5: Solve for x
    x = 375,137.61/613.18
  6. Step 6: Final answer
    x = 611.79

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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.