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Finding the Fourth Proportional to 788.14, 1,086.85 and 648.11

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Solution

The fourth proportional to 788.14, 1,086.85 and 648.11 is: 893.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    788.14 : 1,086.85 = 648.11 : x
  2. Step 2: Convert to fraction form
    788.14/1,086.85 = 648.11/x
  3. Step 3: Cross multiply
    788.14x = 1,086.85 × 648.11
  4. Step 4: Simplify right side
    788.14x = 704,401.88
  5. Step 5: Solve for x
    x = 704,401.88/788.14
  6. Step 6: Final answer
    x = 893.75

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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.