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Finding the Fourth Proportional to 1,264.20, 1,893.52 and 613.56

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Solution

The fourth proportional to 1,264.20, 1,893.52 and 613.56 is: 918.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,264.20 : 1,893.52 = 613.56 : x
  2. Step 2: Convert to fraction form
    1,264.20/1,893.52 = 613.56/x
  3. Step 3: Cross multiply
    1,264.20x = 1,893.52 × 613.56
  4. Step 4: Simplify right side
    1,264.20x = 1,161,788.13
  5. Step 5: Solve for x
    x = 1,161,788.13/1,264.20
  6. Step 6: Final answer
    x = 918.99

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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.