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Finding the Fourth Proportional to 1,243.16, 1,715.49 and 745.70

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Solution

The fourth proportional to 1,243.16, 1,715.49 and 745.70 is: 1,029.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.16 : 1,715.49 = 745.70 : x
  2. Step 2: Convert to fraction form
    1,243.16/1,715.49 = 745.70/x
  3. Step 3: Cross multiply
    1,243.16x = 1,715.49 × 745.70
  4. Step 4: Simplify right side
    1,243.16x = 1,279,240.89
  5. Step 5: Solve for x
    x = 1,279,240.89/1,243.16
  6. Step 6: Final answer
    x = 1,029.02

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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.