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Finding the Fourth Proportional to 812.61, 1,123.07 and 603.09

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Solution

The fourth proportional to 812.61, 1,123.07 and 603.09 is: 833.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.61 : 1,123.07 = 603.09 : x
  2. Step 2: Convert to fraction form
    812.61/1,123.07 = 603.09/x
  3. Step 3: Cross multiply
    812.61x = 1,123.07 × 603.09
  4. Step 4: Simplify right side
    812.61x = 677,309.27
  5. Step 5: Solve for x
    x = 677,309.27/812.61
  6. Step 6: Final answer
    x = 833.50

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1.5x scale

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.