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Finding the Fourth Proportional to 1,269.88, 1,752.22 and 772.48

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Solution

The fourth proportional to 1,269.88, 1,752.22 and 772.48 is: 1,065.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.88 : 1,752.22 = 772.48 : x
  2. Step 2: Convert to fraction form
    1,269.88/1,752.22 = 772.48/x
  3. Step 3: Cross multiply
    1,269.88x = 1,752.22 × 772.48
  4. Step 4: Simplify right side
    1,269.88x = 1,353,554.91
  5. Step 5: Solve for x
    x = 1,353,554.91/1,269.88
  6. Step 6: Final answer
    x = 1,065.89

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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.