Home / 1,311.07-1,809.45-1,200.35

Finding the Fourth Proportional to 1,311.07, 1,809.45 and 1,200.35

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Solution

The fourth proportional to 1,311.07, 1,809.45 and 1,200.35 is: 1,656.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.07 : 1,809.45 = 1,200.35 : x
  2. Step 2: Convert to fraction form
    1,311.07/1,809.45 = 1,200.35/x
  3. Step 3: Cross multiply
    1,311.07x = 1,809.45 × 1,200.35
  4. Step 4: Simplify right side
    1,311.07x = 2,171,964.26
  5. Step 5: Solve for x
    x = 2,171,964.26/1,311.07
  6. Step 6: Final answer
    x = 1,656.64

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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.