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Finding the Fourth Proportional to 412.98, 619.20 and 207.66

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Solution

The fourth proportional to 412.98, 619.20 and 207.66 is: 311.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.98 : 619.20 = 207.66 : x
  2. Step 2: Convert to fraction form
    412.98/619.20 = 207.66/x
  3. Step 3: Cross multiply
    412.98x = 619.20 × 207.66
  4. Step 4: Simplify right side
    412.98x = 128,583.07
  5. Step 5: Solve for x
    x = 128,583.07/412.98
  6. Step 6: Final answer
    x = 311.35

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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.