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Finding the Fourth Proportional to 786.90, 1,179.88 and 324.98

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Solution

The fourth proportional to 786.90, 1,179.88 and 324.98 is: 487.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.90 : 1,179.88 = 324.98 : x
  2. Step 2: Convert to fraction form
    786.90/1,179.88 = 324.98/x
  3. Step 3: Cross multiply
    786.90x = 1,179.88 × 324.98
  4. Step 4: Simplify right side
    786.90x = 383,437.40
  5. Step 5: Solve for x
    x = 383,437.40/786.90
  6. Step 6: Final answer
    x = 487.28

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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.