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Finding the Fourth Proportional to 2,390.90, 3,586.36 and 747.31

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Solution

The fourth proportional to 2,390.90, 3,586.36 and 747.31 is: 1,120.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,390.90 : 3,586.36 = 747.31 : x
  2. Step 2: Convert to fraction form
    2,390.90/3,586.36 = 747.31/x
  3. Step 3: Cross multiply
    2,390.90x = 3,586.36 × 747.31
  4. Step 4: Simplify right side
    2,390.90x = 2,680,122.69
  5. Step 5: Solve for x
    x = 2,680,122.69/2,390.90
  6. Step 6: Final answer
    x = 1,120.97

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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.