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Finding the Fourth Proportional to 1,205, 1,807.08 and 743.12

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Solution

The fourth proportional to 1,205, 1,807.08 and 743.12 is: 1,114.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205 : 1,807.08 = 743.12 : x
  2. Step 2: Convert to fraction form
    1,205/1,807.08 = 743.12/x
  3. Step 3: Cross multiply
    1,205x = 1,807.08 × 743.12
  4. Step 4: Simplify right side
    1,205x = 1,342,877.29
  5. Step 5: Solve for x
    x = 1,342,877.29/1,205
  6. Step 6: Final answer
    x = 1,114.42

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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.