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Finding the Fourth Proportional to 1,269.42, 1,751.68 and 709.72

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Solution

The fourth proportional to 1,269.42, 1,751.68 and 709.72 is: 979.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,269.42 : 1,751.68 = 709.72 : x
  2. Step 2: Convert to fraction form
    1,269.42/1,751.68 = 709.72/x
  3. Step 3: Cross multiply
    1,269.42x = 1,751.68 × 709.72
  4. Step 4: Simplify right side
    1,269.42x = 1,243,202.33
  5. Step 5: Solve for x
    x = 1,243,202.33/1,269.42
  6. Step 6: Final answer
    x = 979.35

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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.