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Finding the Fourth Proportional to 1,139.93, 1,709.86 and 370.43

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Solution

The fourth proportional to 1,139.93, 1,709.86 and 370.43 is: 555.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.93 : 1,709.86 = 370.43 : x
  2. Step 2: Convert to fraction form
    1,139.93/1,709.86 = 370.43/x
  3. Step 3: Cross multiply
    1,139.93x = 1,709.86 × 370.43
  4. Step 4: Simplify right side
    1,139.93x = 633,383.44
  5. Step 5: Solve for x
    x = 633,383.44/1,139.93
  6. Step 6: Final answer
    x = 555.63

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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.