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Finding the Fourth Proportional to 1,169.40, 1,613.06 and 920.34

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Solution

The fourth proportional to 1,169.40, 1,613.06 and 920.34 is: 1,269.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.40 : 1,613.06 = 920.34 : x
  2. Step 2: Convert to fraction form
    1,169.40/1,613.06 = 920.34/x
  3. Step 3: Cross multiply
    1,169.40x = 1,613.06 × 920.34
  4. Step 4: Simplify right side
    1,169.40x = 1,484,563.64
  5. Step 5: Solve for x
    x = 1,484,563.64/1,169.40
  6. Step 6: Final answer
    x = 1,269.51

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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.