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Finding the Fourth Proportional to 1,139.39, 1,709.09 and 317.72

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Solution

The fourth proportional to 1,139.39, 1,709.09 and 317.72 is: 476.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.39 : 1,709.09 = 317.72 : x
  2. Step 2: Convert to fraction form
    1,139.39/1,709.09 = 317.72/x
  3. Step 3: Cross multiply
    1,139.39x = 1,709.09 × 317.72
  4. Step 4: Simplify right side
    1,139.39x = 543,001.94
  5. Step 5: Solve for x
    x = 543,001.94/1,139.39
  6. Step 6: Final answer
    x = 476.57

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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.