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Finding the Fourth Proportional to 1,291.72, 1,935.78 and 743.08

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Solution

The fourth proportional to 1,291.72, 1,935.78 and 743.08 is: 1,113.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,291.72 : 1,935.78 = 743.08 : x
  2. Step 2: Convert to fraction form
    1,291.72/1,935.78 = 743.08/x
  3. Step 3: Cross multiply
    1,291.72x = 1,935.78 × 743.08
  4. Step 4: Simplify right side
    1,291.72x = 1,438,439.40
  5. Step 5: Solve for x
    x = 1,438,439.40/1,291.72
  6. Step 6: Final answer
    x = 1,113.58

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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.