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Finding the Fourth Proportional to 1,139.46, 1,709.28 and 317.74

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Solution

The fourth proportional to 1,139.46, 1,709.28 and 317.74 is: 476.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.46 : 1,709.28 = 317.74 : x
  2. Step 2: Convert to fraction form
    1,139.46/1,709.28 = 317.74/x
  3. Step 3: Cross multiply
    1,139.46x = 1,709.28 × 317.74
  4. Step 4: Simplify right side
    1,139.46x = 543,112.09
  5. Step 5: Solve for x
    x = 543,112.09/1,139.46
  6. Step 6: Final answer
    x = 476.64

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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.