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Finding the Fourth Proportional to 819.77, 1,228.68 and 571.63

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Solution

The fourth proportional to 819.77, 1,228.68 and 571.63 is: 856.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    819.77 : 1,228.68 = 571.63 : x
  2. Step 2: Convert to fraction form
    819.77/1,228.68 = 571.63/x
  3. Step 3: Cross multiply
    819.77x = 1,228.68 × 571.63
  4. Step 4: Simplify right side
    819.77x = 702,350.35
  5. Step 5: Solve for x
    x = 702,350.35/819.77
  6. Step 6: Final answer
    x = 856.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.