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Finding the Fourth Proportional to 1,042.45, 1,437.79 and 739.49

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Solution

The fourth proportional to 1,042.45, 1,437.79 and 739.49 is: 1,019.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.45 : 1,437.79 = 739.49 : x
  2. Step 2: Convert to fraction form
    1,042.45/1,437.79 = 739.49/x
  3. Step 3: Cross multiply
    1,042.45x = 1,437.79 × 739.49
  4. Step 4: Simplify right side
    1,042.45x = 1,063,231.33
  5. Step 5: Solve for x
    x = 1,063,231.33/1,042.45
  6. Step 6: Final answer
    x = 1,019.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.