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Finding the Fourth Proportional to 824.90, 1,237.34 and 208.61

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Solution

The fourth proportional to 824.90, 1,237.34 and 208.61 is: 312.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.90 : 1,237.34 = 208.61 : x
  2. Step 2: Convert to fraction form
    824.90/1,237.34 = 208.61/x
  3. Step 3: Cross multiply
    824.90x = 1,237.34 × 208.61
  4. Step 4: Simplify right side
    824.90x = 258,115.83
  5. Step 5: Solve for x
    x = 258,115.83/824.90
  6. Step 6: Final answer
    x = 312.90

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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.