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Finding the Fourth Proportional to 1,605.50, 2,215.60 and 984.50

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Solution

The fourth proportional to 1,605.50, 2,215.60 and 984.50 is: 1,358.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.50 : 2,215.60 = 984.50 : x
  2. Step 2: Convert to fraction form
    1,605.50/2,215.60 = 984.50/x
  3. Step 3: Cross multiply
    1,605.50x = 2,215.60 × 984.50
  4. Step 4: Simplify right side
    1,605.50x = 2,181,258.20
  5. Step 5: Solve for x
    x = 2,181,258.20/1,605.50
  6. Step 6: Final answer
    x = 1,358.62

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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.