Home / 1,311.30-1,812.48-1,152.74

Finding the Fourth Proportional to 1,311.30, 1,812.48 and 1,152.74

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Solution

The fourth proportional to 1,311.30, 1,812.48 and 1,152.74 is: 1,593.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.30 : 1,812.48 = 1,152.74 : x
  2. Step 2: Convert to fraction form
    1,311.30/1,812.48 = 1,152.74/x
  3. Step 3: Cross multiply
    1,311.30x = 1,812.48 × 1,152.74
  4. Step 4: Simplify right side
    1,311.30x = 2,089,318.20
  5. Step 5: Solve for x
    x = 2,089,318.20/1,311.30
  6. Step 6: Final answer
    x = 1,593.32

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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.