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Finding the Fourth Proportional to 481.28, 668.62 and 476.78

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Solution

The fourth proportional to 481.28, 668.62 and 476.78 is: 662.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.28 : 668.62 = 476.78 : x
  2. Step 2: Convert to fraction form
    481.28/668.62 = 476.78/x
  3. Step 3: Cross multiply
    481.28x = 668.62 × 476.78
  4. Step 4: Simplify right side
    481.28x = 318,781.90
  5. Step 5: Solve for x
    x = 318,781.90/481.28
  6. Step 6: Final answer
    x = 662.37

Related Problems

Find fourth proportional to 240.64, 334.31 and 238.39
Half scale
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Double scale
Find fourth proportional to 482.28, 670.01 and 477.78
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.