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Finding the Fourth Proportional to 681.44, 939.84 and 448.64

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Solution

The fourth proportional to 681.44, 939.84 and 448.64 is: 618.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.44 : 939.84 = 448.64 : x
  2. Step 2: Convert to fraction form
    681.44/939.84 = 448.64/x
  3. Step 3: Cross multiply
    681.44x = 939.84 × 448.64
  4. Step 4: Simplify right side
    681.44x = 421,649.82
  5. Step 5: Solve for x
    x = 421,649.82/681.44
  6. Step 6: Final answer
    x = 618.76

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1.5x scale

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.