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Finding the Fourth Proportional to 1,243.47, 1,715.61 and 745.93

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Solution

The fourth proportional to 1,243.47, 1,715.61 and 745.93 is: 1,029.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.47 : 1,715.61 = 745.93 : x
  2. Step 2: Convert to fraction form
    1,243.47/1,715.61 = 745.93/x
  3. Step 3: Cross multiply
    1,243.47x = 1,715.61 × 745.93
  4. Step 4: Simplify right side
    1,243.47x = 1,279,720.68
  5. Step 5: Solve for x
    x = 1,279,720.68/1,243.47
  6. Step 6: Final answer
    x = 1,029.15

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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.