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Finding the Fourth Proportional to 826.14, 1,139.58 and 774.66

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Solution

The fourth proportional to 826.14, 1,139.58 and 774.66 is: 1,068.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    826.14 : 1,139.58 = 774.66 : x
  2. Step 2: Convert to fraction form
    826.14/1,139.58 = 774.66/x
  3. Step 3: Cross multiply
    826.14x = 1,139.58 × 774.66
  4. Step 4: Simplify right side
    826.14x = 882,787.04
  5. Step 5: Solve for x
    x = 882,787.04/826.14
  6. Step 6: Final answer
    x = 1,068.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.