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Finding the Fourth Proportional to 7,279, 10,918.50 and 1,807

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Solution

The fourth proportional to 7,279, 10,918.50 and 1,807 is: 2,710.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,279 : 10,918.50 = 1,807 : x
  2. Step 2: Convert to fraction form
    7,279/10,918.50 = 1,807/x
  3. Step 3: Cross multiply
    7,279x = 10,918.50 × 1,807
  4. Step 4: Simplify right side
    7,279x = 19,729,729.50
  5. Step 5: Solve for x
    x = 19,729,729.50/7,279
  6. Step 6: Final answer
    x = 2,710.50

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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.