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Finding the Fourth Proportional to 776.81, 1,159.50 and 711.87

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Solution

The fourth proportional to 776.81, 1,159.50 and 711.87 is: 1,062.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.81 : 1,159.50 = 711.87 : x
  2. Step 2: Convert to fraction form
    776.81/1,159.50 = 711.87/x
  3. Step 3: Cross multiply
    776.81x = 1,159.50 × 711.87
  4. Step 4: Simplify right side
    776.81x = 825,413.27
  5. Step 5: Solve for x
    x = 825,413.27/776.81
  6. Step 6: Final answer
    x = 1,062.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.