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Finding the Fourth Proportional to 771.48, 1,064.49 and 605.70

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Solution

The fourth proportional to 771.48, 1,064.49 and 605.70 is: 835.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    771.48 : 1,064.49 = 605.70 : x
  2. Step 2: Convert to fraction form
    771.48/1,064.49 = 605.70/x
  3. Step 3: Cross multiply
    771.48x = 1,064.49 × 605.70
  4. Step 4: Simplify right side
    771.48x = 644,761.59
  5. Step 5: Solve for x
    x = 644,761.59/771.48
  6. Step 6: Final answer
    x = 835.75

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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.