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Finding the Fourth Proportional to 929.90, 1,393.23 and 490.49

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Solution

The fourth proportional to 929.90, 1,393.23 and 490.49 is: 734.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.90 : 1,393.23 = 490.49 : x
  2. Step 2: Convert to fraction form
    929.90/1,393.23 = 490.49/x
  3. Step 3: Cross multiply
    929.90x = 1,393.23 × 490.49
  4. Step 4: Simplify right side
    929.90x = 683,365.38
  5. Step 5: Solve for x
    x = 683,365.38/929.90
  6. Step 6: Final answer
    x = 734.88

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Double scale
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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.