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Finding the Fourth Proportional to 773.50, 1,153.34 and 687.64

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Solution

The fourth proportional to 773.50, 1,153.34 and 687.64 is: 1,025.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    773.50 : 1,153.34 = 687.64 : x
  2. Step 2: Convert to fraction form
    773.50/1,153.34 = 687.64/x
  3. Step 3: Cross multiply
    773.50x = 1,153.34 × 687.64
  4. Step 4: Simplify right side
    773.50x = 793,076.95
  5. Step 5: Solve for x
    x = 793,076.95/773.50
  6. Step 6: Final answer
    x = 1,025.32

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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.