Home / 1,131.15-1,695.96-390.57

Finding the Fourth Proportional to 1,131.15, 1,695.96 and 390.57

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Solution

The fourth proportional to 1,131.15, 1,695.96 and 390.57 is: 585.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.15 : 1,695.96 = 390.57 : x
  2. Step 2: Convert to fraction form
    1,131.15/1,695.96 = 390.57/x
  3. Step 3: Cross multiply
    1,131.15x = 1,695.96 × 390.57
  4. Step 4: Simplify right side
    1,131.15x = 662,391.10
  5. Step 5: Solve for x
    x = 662,391.10/1,131.15
  6. Step 6: Final answer
    x = 585.59

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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.