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Finding the Fourth Proportional to 1,115.74, 1,674 and 499.39

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Solution

The fourth proportional to 1,115.74, 1,674 and 499.39 is: 749.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.74 : 1,674 = 499.39 : x
  2. Step 2: Convert to fraction form
    1,115.74/1,674 = 499.39/x
  3. Step 3: Cross multiply
    1,115.74x = 1,674 × 499.39
  4. Step 4: Simplify right side
    1,115.74x = 835,978.86
  5. Step 5: Solve for x
    x = 835,978.86/1,115.74
  6. Step 6: Final answer
    x = 749.26

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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.