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Finding the Fourth Proportional to 1,422.48, 2,134.20 and 738

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Solution

The fourth proportional to 1,422.48, 2,134.20 and 738 is: 1,107.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,422.48 : 2,134.20 = 738 : x
  2. Step 2: Convert to fraction form
    1,422.48/2,134.20 = 738/x
  3. Step 3: Cross multiply
    1,422.48x = 2,134.20 × 738
  4. Step 4: Simplify right side
    1,422.48x = 1,575,039.60
  5. Step 5: Solve for x
    x = 1,575,039.60/1,422.48
  6. Step 6: Final answer
    x = 1,107.25

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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.