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Finding the Fourth Proportional to 873.78, 1,309.05 and 776.58

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Solution

The fourth proportional to 873.78, 1,309.05 and 776.58 is: 1,163.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.78 : 1,309.05 = 776.58 : x
  2. Step 2: Convert to fraction form
    873.78/1,309.05 = 776.58/x
  3. Step 3: Cross multiply
    873.78x = 1,309.05 × 776.58
  4. Step 4: Simplify right side
    873.78x = 1,016,582.05
  5. Step 5: Solve for x
    x = 1,016,582.05/873.78
  6. Step 6: Final answer
    x = 1,163.43

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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.