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Finding the Fourth Proportional to 929.84, 1,280.26 and 789.68

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Solution

The fourth proportional to 929.84, 1,280.26 and 789.68 is: 1,087.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.84 : 1,280.26 = 789.68 : x
  2. Step 2: Convert to fraction form
    929.84/1,280.26 = 789.68/x
  3. Step 3: Cross multiply
    929.84x = 1,280.26 × 789.68
  4. Step 4: Simplify right side
    929.84x = 1,010,995.72
  5. Step 5: Solve for x
    x = 1,010,995.72/929.84
  6. Step 6: Final answer
    x = 1,087.28

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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.