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Finding the Fourth Proportional to 1,269.50, 1,752.20 and 745.70

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Solution

The fourth proportional to 1,269.50, 1,752.20 and 745.70 is: 1,029.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.50 : 1,752.20 = 745.70 : x
  2. Step 2: Convert to fraction form
    1,269.50/1,752.20 = 745.70/x
  3. Step 3: Cross multiply
    1,269.50x = 1,752.20 × 745.70
  4. Step 4: Simplify right side
    1,269.50x = 1,306,615.54
  5. Step 5: Solve for x
    x = 1,306,615.54/1,269.50
  6. Step 6: Final answer
    x = 1,029.24

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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.