Home / 1,128.18-1,695.38-985.35

Finding the Fourth Proportional to 1,128.18, 1,695.38 and 985.35

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Solution

The fourth proportional to 1,128.18, 1,695.38 and 985.35 is: 1,480.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.18 : 1,695.38 = 985.35 : x
  2. Step 2: Convert to fraction form
    1,128.18/1,695.38 = 985.35/x
  3. Step 3: Cross multiply
    1,128.18x = 1,695.38 × 985.35
  4. Step 4: Simplify right side
    1,128.18x = 1,670,540.12
  5. Step 5: Solve for x
    x = 1,670,540.12/1,128.18
  6. Step 6: Final answer
    x = 1,480.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.