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Finding the Fourth Proportional to 448.65, 671.88 and 428.89

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Solution

The fourth proportional to 448.65, 671.88 and 428.89 is: 642.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.65 : 671.88 = 428.89 : x
  2. Step 2: Convert to fraction form
    448.65/671.88 = 428.89/x
  3. Step 3: Cross multiply
    448.65x = 671.88 × 428.89
  4. Step 4: Simplify right side
    448.65x = 288,162.61
  5. Step 5: Solve for x
    x = 288,162.61/448.65
  6. Step 6: Final answer
    x = 642.29

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.