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Finding the Fourth Proportional to 1,126.54, 1,689.84 and 613.54

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Solution

The fourth proportional to 1,126.54, 1,689.84 and 613.54 is: 920.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,126.54 : 1,689.84 = 613.54 : x
  2. Step 2: Convert to fraction form
    1,126.54/1,689.84 = 613.54/x
  3. Step 3: Cross multiply
    1,126.54x = 1,689.84 × 613.54
  4. Step 4: Simplify right side
    1,126.54x = 1,036,784.43
  5. Step 5: Solve for x
    x = 1,036,784.43/1,126.54
  6. Step 6: Final answer
    x = 920.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.