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Finding the Fourth Proportional to 662.82, 915.12 and 621.51

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Solution

The fourth proportional to 662.82, 915.12 and 621.51 is: 858.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    662.82 : 915.12 = 621.51 : x
  2. Step 2: Convert to fraction form
    662.82/915.12 = 621.51/x
  3. Step 3: Cross multiply
    662.82x = 915.12 × 621.51
  4. Step 4: Simplify right side
    662.82x = 568,756.23
  5. Step 5: Solve for x
    x = 568,756.23/662.82
  6. Step 6: Final answer
    x = 858.09

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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.