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Finding the Fourth Proportional to 776.10, 1,069.02 and 635.70

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Solution

The fourth proportional to 776.10, 1,069.02 and 635.70 is: 875.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.10 : 1,069.02 = 635.70 : x
  2. Step 2: Convert to fraction form
    776.10/1,069.02 = 635.70/x
  3. Step 3: Cross multiply
    776.10x = 1,069.02 × 635.70
  4. Step 4: Simplify right side
    776.10x = 679,576.01
  5. Step 5: Solve for x
    x = 679,576.01/776.10
  6. Step 6: Final answer
    x = 875.63

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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.