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Finding the Fourth Proportional to 1,289.44, 1,779.12 and 765.38

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Solution

The fourth proportional to 1,289.44, 1,779.12 and 765.38 is: 1,056.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.44 : 1,779.12 = 765.38 : x
  2. Step 2: Convert to fraction form
    1,289.44/1,779.12 = 765.38/x
  3. Step 3: Cross multiply
    1,289.44x = 1,779.12 × 765.38
  4. Step 4: Simplify right side
    1,289.44x = 1,361,702.87
  5. Step 5: Solve for x
    x = 1,361,702.87/1,289.44
  6. Step 6: Final answer
    x = 1,056.04

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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.