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Finding the Fourth Proportional to 918.92, 1,268.12 and 520.61

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Solution

The fourth proportional to 918.92, 1,268.12 and 520.61 is: 718.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.92 : 1,268.12 = 520.61 : x
  2. Step 2: Convert to fraction form
    918.92/1,268.12 = 520.61/x
  3. Step 3: Cross multiply
    918.92x = 1,268.12 × 520.61
  4. Step 4: Simplify right side
    918.92x = 660,187.01
  5. Step 5: Solve for x
    x = 660,187.01/918.92
  6. Step 6: Final answer
    x = 718.44

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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.