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Finding the Fourth Proportional to 816.19, 1,125.49 and 629.71

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Solution

The fourth proportional to 816.19, 1,125.49 and 629.71 is: 868.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.19 : 1,125.49 = 629.71 : x
  2. Step 2: Convert to fraction form
    816.19/1,125.49 = 629.71/x
  3. Step 3: Cross multiply
    816.19x = 1,125.49 × 629.71
  4. Step 4: Simplify right side
    816.19x = 708,732.31
  5. Step 5: Solve for x
    x = 708,732.31/816.19
  6. Step 6: Final answer
    x = 868.34

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Double scale
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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.