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Finding the Fourth Proportional to 1,063.89, 1,467.99 and 621.90

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Solution

The fourth proportional to 1,063.89, 1,467.99 and 621.90 is: 858.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,063.89 : 1,467.99 = 621.90 : x
  2. Step 2: Convert to fraction form
    1,063.89/1,467.99 = 621.90/x
  3. Step 3: Cross multiply
    1,063.89x = 1,467.99 × 621.90
  4. Step 4: Simplify right side
    1,063.89x = 912,942.98
  5. Step 5: Solve for x
    x = 912,942.98/1,063.89
  6. Step 6: Final answer
    x = 858.12

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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.