Home / 1,015.65-1,513.37-905.11

Finding the Fourth Proportional to 1,015.65, 1,513.37 and 905.11

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Solution

The fourth proportional to 1,015.65, 1,513.37 and 905.11 is: 1,348.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.65 : 1,513.37 = 905.11 : x
  2. Step 2: Convert to fraction form
    1,015.65/1,513.37 = 905.11/x
  3. Step 3: Cross multiply
    1,015.65x = 1,513.37 × 905.11
  4. Step 4: Simplify right side
    1,015.65x = 1,369,764.80
  5. Step 5: Solve for x
    x = 1,369,764.80/1,015.65
  6. Step 6: Final answer
    x = 1,348.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.