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Finding the Fourth Proportional to 1,200.40, 1,803.30 and 835.90

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Solution

The fourth proportional to 1,200.40, 1,803.30 and 835.90 is: 1,255.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.40 : 1,803.30 = 835.90 : x
  2. Step 2: Convert to fraction form
    1,200.40/1,803.30 = 835.90/x
  3. Step 3: Cross multiply
    1,200.40x = 1,803.30 × 835.90
  4. Step 4: Simplify right side
    1,200.40x = 1,507,378.47
  5. Step 5: Solve for x
    x = 1,507,378.47/1,200.40
  6. Step 6: Final answer
    x = 1,255.73

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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.