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Finding the Fourth Proportional to 768.44, 1,059.15 and 621.02

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Solution

The fourth proportional to 768.44, 1,059.15 and 621.02 is: 855.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.44 : 1,059.15 = 621.02 : x
  2. Step 2: Convert to fraction form
    768.44/1,059.15 = 621.02/x
  3. Step 3: Cross multiply
    768.44x = 1,059.15 × 621.02
  4. Step 4: Simplify right side
    768.44x = 657,744.93
  5. Step 5: Solve for x
    x = 657,744.93/768.44
  6. Step 6: Final answer
    x = 855.95

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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.