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Finding the Fourth Proportional to 814.05, 1,124.73 and 640.71

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Solution

The fourth proportional to 814.05, 1,124.73 and 640.71 is: 885.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    814.05 : 1,124.73 = 640.71 : x
  2. Step 2: Convert to fraction form
    814.05/1,124.73 = 640.71/x
  3. Step 3: Cross multiply
    814.05x = 1,124.73 × 640.71
  4. Step 4: Simplify right side
    814.05x = 720,625.76
  5. Step 5: Solve for x
    x = 720,625.76/814.05
  6. Step 6: Final answer
    x = 885.24

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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.