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Finding the Fourth Proportional to 698.21, 1,045.79 and 331.88

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Solution

The fourth proportional to 698.21, 1,045.79 and 331.88 is: 497.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    698.21 : 1,045.79 = 331.88 : x
  2. Step 2: Convert to fraction form
    698.21/1,045.79 = 331.88/x
  3. Step 3: Cross multiply
    698.21x = 1,045.79 × 331.88
  4. Step 4: Simplify right side
    698.21x = 347,075.13
  5. Step 5: Solve for x
    x = 347,075.13/698.21
  6. Step 6: Final answer
    x = 497.10

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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.