Home / 1,190.56-1,643.28-724.72

Finding the Fourth Proportional to 1,190.56, 1,643.28 and 724.72

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Solution

The fourth proportional to 1,190.56, 1,643.28 and 724.72 is: 1,000.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.56 : 1,643.28 = 724.72 : x
  2. Step 2: Convert to fraction form
    1,190.56/1,643.28 = 724.72/x
  3. Step 3: Cross multiply
    1,190.56x = 1,643.28 × 724.72
  4. Step 4: Simplify right side
    1,190.56x = 1,190,917.88
  5. Step 5: Solve for x
    x = 1,190,917.88/1,190.56
  6. Step 6: Final answer
    x = 1,000.30

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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.