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Finding the Fourth Proportional to 1,289.45, 1,779.77 and 792.45

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Solution

The fourth proportional to 1,289.45, 1,779.77 and 792.45 is: 1,093.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.45 : 1,779.77 = 792.45 : x
  2. Step 2: Convert to fraction form
    1,289.45/1,779.77 = 792.45/x
  3. Step 3: Cross multiply
    1,289.45x = 1,779.77 × 792.45
  4. Step 4: Simplify right side
    1,289.45x = 1,410,380.72
  5. Step 5: Solve for x
    x = 1,410,380.72/1,289.45
  6. Step 6: Final answer
    x = 1,093.78

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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.