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Finding the Fourth Proportional to 1,605.40, 2,215.40 and 984.40

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Solution

The fourth proportional to 1,605.40, 2,215.40 and 984.40 is: 1,358.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,605.40 : 2,215.40 = 984.40 : x
  2. Step 2: Convert to fraction form
    1,605.40/2,215.40 = 984.40/x
  3. Step 3: Cross multiply
    1,605.40x = 2,215.40 × 984.40
  4. Step 4: Simplify right side
    1,605.40x = 2,180,839.76
  5. Step 5: Solve for x
    x = 2,180,839.76/1,605.40
  6. Step 6: Final answer
    x = 1,358.44

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1.5x scale

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.