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Finding the Fourth Proportional to 768.88, 1,061.05 and 419.56

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Solution

The fourth proportional to 768.88, 1,061.05 and 419.56 is: 578.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.88 : 1,061.05 = 419.56 : x
  2. Step 2: Convert to fraction form
    768.88/1,061.05 = 419.56/x
  3. Step 3: Cross multiply
    768.88x = 1,061.05 × 419.56
  4. Step 4: Simplify right side
    768.88x = 445,174.14
  5. Step 5: Solve for x
    x = 445,174.14/768.88
  6. Step 6: Final answer
    x = 578.99

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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.