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Finding the Fourth Proportional to 1,909.70, 2,635.90 and 1,124

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Solution

The fourth proportional to 1,909.70, 2,635.90 and 1,124 is: 1,551.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.70 : 2,635.90 = 1,124 : x
  2. Step 2: Convert to fraction form
    1,909.70/2,635.90 = 1,124/x
  3. Step 3: Cross multiply
    1,909.70x = 2,635.90 × 1,124
  4. Step 4: Simplify right side
    1,909.70x = 2,962,751.60
  5. Step 5: Solve for x
    x = 2,962,751.60/1,909.70
  6. Step 6: Final answer
    x = 1,551.42

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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.