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Finding the Fourth Proportional to 1,289.74, 1,779.88 and 758.66

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Solution

The fourth proportional to 1,289.74, 1,779.88 and 758.66 is: 1,046.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,289.74 : 1,779.88 = 758.66 : x
  2. Step 2: Convert to fraction form
    1,289.74/1,779.88 = 758.66/x
  3. Step 3: Cross multiply
    1,289.74x = 1,779.88 × 758.66
  4. Step 4: Simplify right side
    1,289.74x = 1,350,327.74
  5. Step 5: Solve for x
    x = 1,350,327.74/1,289.74
  6. Step 6: Final answer
    x = 1,046.98

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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.