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Finding the Fourth Proportional to 1,205.87, 1,807.43 and 912.40

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Solution

The fourth proportional to 1,205.87, 1,807.43 and 912.40 is: 1,367.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.87 : 1,807.43 = 912.40 : x
  2. Step 2: Convert to fraction form
    1,205.87/1,807.43 = 912.40/x
  3. Step 3: Cross multiply
    1,205.87x = 1,807.43 × 912.40
  4. Step 4: Simplify right side
    1,205.87x = 1,649,090.05
  5. Step 5: Solve for x
    x = 1,649,090.05/1,205.87
  6. Step 6: Final answer
    x = 1,367.56

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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.