Home / 1,431.11-1,976.85-1,120.31

Finding the Fourth Proportional to 1,431.11, 1,976.85 and 1,120.31

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Solution

The fourth proportional to 1,431.11, 1,976.85 and 1,120.31 is: 1,547.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.11 : 1,976.85 = 1,120.31 : x
  2. Step 2: Convert to fraction form
    1,431.11/1,976.85 = 1,120.31/x
  3. Step 3: Cross multiply
    1,431.11x = 1,976.85 × 1,120.31
  4. Step 4: Simplify right side
    1,431.11x = 2,214,684.82
  5. Step 5: Solve for x
    x = 2,214,684.82/1,431.11
  6. Step 6: Final answer
    x = 1,547.53

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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.