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Finding the Fourth Proportional to 1,224.95, 1,690.47 and 727.61

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Solution

The fourth proportional to 1,224.95, 1,690.47 and 727.61 is: 1,004.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.95 : 1,690.47 = 727.61 : x
  2. Step 2: Convert to fraction form
    1,224.95/1,690.47 = 727.61/x
  3. Step 3: Cross multiply
    1,224.95x = 1,690.47 × 727.61
  4. Step 4: Simplify right side
    1,224.95x = 1,229,994.42
  5. Step 5: Solve for x
    x = 1,229,994.42/1,224.95
  6. Step 6: Final answer
    x = 1,004.12

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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.