Home / 1,008.28-1,390.37-985.65

Finding the Fourth Proportional to 1,008.28, 1,390.37 and 985.65

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Solution

The fourth proportional to 1,008.28, 1,390.37 and 985.65 is: 1,359.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.28 : 1,390.37 = 985.65 : x
  2. Step 2: Convert to fraction form
    1,008.28/1,390.37 = 985.65/x
  3. Step 3: Cross multiply
    1,008.28x = 1,390.37 × 985.65
  4. Step 4: Simplify right side
    1,008.28x = 1,370,418.19
  5. Step 5: Solve for x
    x = 1,370,418.19/1,008.28
  6. Step 6: Final answer
    x = 1,359.16

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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.