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Finding the Fourth Proportional to 1,280.22, 1,916.01 and 793.68

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Solution

The fourth proportional to 1,280.22, 1,916.01 and 793.68 is: 1,187.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.22 : 1,916.01 = 793.68 : x
  2. Step 2: Convert to fraction form
    1,280.22/1,916.01 = 793.68/x
  3. Step 3: Cross multiply
    1,280.22x = 1,916.01 × 793.68
  4. Step 4: Simplify right side
    1,280.22x = 1,520,698.82
  5. Step 5: Solve for x
    x = 1,520,698.82/1,280.22
  6. Step 6: Final answer
    x = 1,187.84

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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.