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Finding the Fourth Proportional to 448.24, 668.60 and 428.80

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Solution

The fourth proportional to 448.24, 668.60 and 428.80 is: 639.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.24 : 668.60 = 428.80 : x
  2. Step 2: Convert to fraction form
    448.24/668.60 = 428.80/x
  3. Step 3: Cross multiply
    448.24x = 668.60 × 428.80
  4. Step 4: Simplify right side
    448.24x = 286,695.68
  5. Step 5: Solve for x
    x = 286,695.68/448.24
  6. Step 6: Final answer
    x = 639.60

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.