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Finding the Fourth Proportional to 1,391.62, 2,085.80 and 620.50

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Solution

The fourth proportional to 1,391.62, 2,085.80 and 620.50 is: 930.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.62 : 2,085.80 = 620.50 : x
  2. Step 2: Convert to fraction form
    1,391.62/2,085.80 = 620.50/x
  3. Step 3: Cross multiply
    1,391.62x = 2,085.80 × 620.50
  4. Step 4: Simplify right side
    1,391.62x = 1,294,238.90
  5. Step 5: Solve for x
    x = 1,294,238.90/1,391.62
  6. Step 6: Final answer
    x = 930.02

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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.