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Finding the Fourth Proportional to 1,239.78, 1,859.67 and 662.52

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Solution

The fourth proportional to 1,239.78, 1,859.67 and 662.52 is: 993.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.78 : 1,859.67 = 662.52 : x
  2. Step 2: Convert to fraction form
    1,239.78/1,859.67 = 662.52/x
  3. Step 3: Cross multiply
    1,239.78x = 1,859.67 × 662.52
  4. Step 4: Simplify right side
    1,239.78x = 1,232,068.57
  5. Step 5: Solve for x
    x = 1,232,068.57/1,239.78
  6. Step 6: Final answer
    x = 993.78

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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.