Home / 2,155.40-3,231.30-1,129.40

Finding the Fourth Proportional to 2,155.40, 3,231.30 and 1,129.40

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Solution

The fourth proportional to 2,155.40, 3,231.30 and 1,129.40 is: 1,693.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,155.40 : 3,231.30 = 1,129.40 : x
  2. Step 2: Convert to fraction form
    2,155.40/3,231.30 = 1,129.40/x
  3. Step 3: Cross multiply
    2,155.40x = 3,231.30 × 1,129.40
  4. Step 4: Simplify right side
    2,155.40x = 3,649,430.22
  5. Step 5: Solve for x
    x = 3,649,430.22/2,155.40
  6. Step 6: Final answer
    x = 1,693.16

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1.5x scale

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.