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Finding the Fourth Proportional to 1,109, 1,663.50 and 339.50

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Solution

The fourth proportional to 1,109, 1,663.50 and 339.50 is: 509.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109 : 1,663.50 = 339.50 : x
  2. Step 2: Convert to fraction form
    1,109/1,663.50 = 339.50/x
  3. Step 3: Cross multiply
    1,109x = 1,663.50 × 339.50
  4. Step 4: Simplify right side
    1,109x = 564,758.25
  5. Step 5: Solve for x
    x = 564,758.25/1,109
  6. Step 6: Final answer
    x = 509.25

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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.