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Finding the Fourth Proportional to 1,243.48, 1,715.20 and 745.80

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Solution

The fourth proportional to 1,243.48, 1,715.20 and 745.80 is: 1,028.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.48 : 1,715.20 = 745.80 : x
  2. Step 2: Convert to fraction form
    1,243.48/1,715.20 = 745.80/x
  3. Step 3: Cross multiply
    1,243.48x = 1,715.20 × 745.80
  4. Step 4: Simplify right side
    1,243.48x = 1,279,196.16
  5. Step 5: Solve for x
    x = 1,279,196.16/1,243.48
  6. Step 6: Final answer
    x = 1,028.72

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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.