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Finding the Fourth Proportional to 1,139.38, 1,709.78 and 490.11

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Solution

The fourth proportional to 1,139.38, 1,709.78 and 490.11 is: 735.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.38 : 1,709.78 = 490.11 : x
  2. Step 2: Convert to fraction form
    1,139.38/1,709.78 = 490.11/x
  3. Step 3: Cross multiply
    1,139.38x = 1,709.78 × 490.11
  4. Step 4: Simplify right side
    1,139.38x = 837,977.83
  5. Step 5: Solve for x
    x = 837,977.83/1,139.38
  6. Step 6: Final answer
    x = 735.47

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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.