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Finding the Fourth Proportional to 929.56, 1,392.86 and 490.80

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Solution

The fourth proportional to 929.56, 1,392.86 and 490.80 is: 735.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.56 : 1,392.86 = 490.80 : x
  2. Step 2: Convert to fraction form
    929.56/1,392.86 = 490.80/x
  3. Step 3: Cross multiply
    929.56x = 1,392.86 × 490.80
  4. Step 4: Simplify right side
    929.56x = 683,608.72
  5. Step 5: Solve for x
    x = 683,608.72/929.56
  6. Step 6: Final answer
    x = 735.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.