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Finding the Fourth Proportional to 776.21, 1,164.31 and 489.47

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Solution

The fourth proportional to 776.21, 1,164.31 and 489.47 is: 734.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    776.21 : 1,164.31 = 489.47 : x
  2. Step 2: Convert to fraction form
    776.21/1,164.31 = 489.47/x
  3. Step 3: Cross multiply
    776.21x = 1,164.31 × 489.47
  4. Step 4: Simplify right side
    776.21x = 569,887.77
  5. Step 5: Solve for x
    x = 569,887.77/776.21
  6. Step 6: Final answer
    x = 734.20

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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.