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Finding the Fourth Proportional to 806.94, 1,113.03 and 640.89

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Solution

The fourth proportional to 806.94, 1,113.03 and 640.89 is: 883.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    806.94 : 1,113.03 = 640.89 : x
  2. Step 2: Convert to fraction form
    806.94/1,113.03 = 640.89/x
  3. Step 3: Cross multiply
    806.94x = 1,113.03 × 640.89
  4. Step 4: Simplify right side
    806.94x = 713,329.80
  5. Step 5: Solve for x
    x = 713,329.80/806.94
  6. Step 6: Final answer
    x = 883.99

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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.