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Finding the Fourth Proportional to 1,490.78, 2,234.23 and 612.28

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Solution

The fourth proportional to 1,490.78, 2,234.23 and 612.28 is: 917.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,490.78 : 2,234.23 = 612.28 : x
  2. Step 2: Convert to fraction form
    1,490.78/2,234.23 = 612.28/x
  3. Step 3: Cross multiply
    1,490.78x = 2,234.23 × 612.28
  4. Step 4: Simplify right side
    1,490.78x = 1,367,985.33
  5. Step 5: Solve for x
    x = 1,367,985.33/1,490.78
  6. Step 6: Final answer
    x = 917.63

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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.