Home / 1,311.36-1,812.96-1,147.20

Finding the Fourth Proportional to 1,311.36, 1,812.96 and 1,147.20

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Solution

The fourth proportional to 1,311.36, 1,812.96 and 1,147.20 is: 1,586.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.36 : 1,812.96 = 1,147.20 : x
  2. Step 2: Convert to fraction form
    1,311.36/1,812.96 = 1,147.20/x
  3. Step 3: Cross multiply
    1,311.36x = 1,812.96 × 1,147.20
  4. Step 4: Simplify right side
    1,311.36x = 2,079,827.71
  5. Step 5: Solve for x
    x = 2,079,827.71/1,311.36
  6. Step 6: Final answer
    x = 1,586.01

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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.