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Finding the Fourth Proportional to 1,535.44, 2,118.81 and 905.99

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Solution

The fourth proportional to 1,535.44, 2,118.81 and 905.99 is: 1,250.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,535.44 : 2,118.81 = 905.99 : x
  2. Step 2: Convert to fraction form
    1,535.44/2,118.81 = 905.99/x
  3. Step 3: Cross multiply
    1,535.44x = 2,118.81 × 905.99
  4. Step 4: Simplify right side
    1,535.44x = 1,919,605.55
  5. Step 5: Solve for x
    x = 1,919,605.55/1,535.44
  6. Step 6: Final answer
    x = 1,250.20

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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.