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Finding the Fourth Proportional to 1,289.17, 1,779.26 and 758.15

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Solution

The fourth proportional to 1,289.17, 1,779.26 and 758.15 is: 1,046.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.17 : 1,779.26 = 758.15 : x
  2. Step 2: Convert to fraction form
    1,289.17/1,779.26 = 758.15/x
  3. Step 3: Cross multiply
    1,289.17x = 1,779.26 × 758.15
  4. Step 4: Simplify right side
    1,289.17x = 1,348,945.97
  5. Step 5: Solve for x
    x = 1,348,945.97/1,289.17
  6. Step 6: Final answer
    x = 1,046.37

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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.