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Finding the Fourth Proportional to 1,269.84, 1,752.68 and 772.28

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Solution

The fourth proportional to 1,269.84, 1,752.68 and 772.28 is: 1,065.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.84 : 1,752.68 = 772.28 : x
  2. Step 2: Convert to fraction form
    1,269.84/1,752.68 = 772.28/x
  3. Step 3: Cross multiply
    1,269.84x = 1,752.68 × 772.28
  4. Step 4: Simplify right side
    1,269.84x = 1,353,559.71
  5. Step 5: Solve for x
    x = 1,353,559.71/1,269.84
  6. Step 6: Final answer
    x = 1,065.93

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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.