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Finding the Fourth Proportional to 2,085.40, 3,128.09 and 624.36

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Solution

The fourth proportional to 2,085.40, 3,128.09 and 624.36 is: 936.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.40 : 3,128.09 = 624.36 : x
  2. Step 2: Convert to fraction form
    2,085.40/3,128.09 = 624.36/x
  3. Step 3: Cross multiply
    2,085.40x = 3,128.09 × 624.36
  4. Step 4: Simplify right side
    2,085.40x = 1,953,050.55
  5. Step 5: Solve for x
    x = 1,953,050.55/2,085.40
  6. Step 6: Final answer
    x = 936.54

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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.