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Finding the Fourth Proportional to 918.71, 1,268.22 and 603.98

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Solution

The fourth proportional to 918.71, 1,268.22 and 603.98 is: 833.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.71 : 1,268.22 = 603.98 : x
  2. Step 2: Convert to fraction form
    918.71/1,268.22 = 603.98/x
  3. Step 3: Cross multiply
    918.71x = 1,268.22 × 603.98
  4. Step 4: Simplify right side
    918.71x = 765,979.52
  5. Step 5: Solve for x
    x = 765,979.52/918.71
  6. Step 6: Final answer
    x = 833.76

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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.