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Finding the Fourth Proportional to 929.03, 1,280.79 and 680.36

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Solution

The fourth proportional to 929.03, 1,280.79 and 680.36 is: 937.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.03 : 1,280.79 = 680.36 : x
  2. Step 2: Convert to fraction form
    929.03/1,280.79 = 680.36/x
  3. Step 3: Cross multiply
    929.03x = 1,280.79 × 680.36
  4. Step 4: Simplify right side
    929.03x = 871,391.88
  5. Step 5: Solve for x
    x = 871,391.88/929.03
  6. Step 6: Final answer
    x = 937.96

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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.