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Finding the Fourth Proportional to 690.99, 953.74 and 481.20

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Solution

The fourth proportional to 690.99, 953.74 and 481.20 is: 664.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.99 : 953.74 = 481.20 : x
  2. Step 2: Convert to fraction form
    690.99/953.74 = 481.20/x
  3. Step 3: Cross multiply
    690.99x = 953.74 × 481.20
  4. Step 4: Simplify right side
    690.99x = 458,939.69
  5. Step 5: Solve for x
    x = 458,939.69/690.99
  6. Step 6: Final answer
    x = 664.18

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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.