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Finding the Fourth Proportional to 498.64, 744.36 and 428.47

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Solution

The fourth proportional to 498.64, 744.36 and 428.47 is: 639.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    498.64 : 744.36 = 428.47 : x
  2. Step 2: Convert to fraction form
    498.64/744.36 = 428.47/x
  3. Step 3: Cross multiply
    498.64x = 744.36 × 428.47
  4. Step 4: Simplify right side
    498.64x = 318,936.65
  5. Step 5: Solve for x
    x = 318,936.65/498.64
  6. Step 6: Final answer
    x = 639.61

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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.