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Finding the Fourth Proportional to 2,912.98, 4,018.76 and 1,918.74

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Solution

The fourth proportional to 2,912.98, 4,018.76 and 1,918.74 is: 2,647.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,912.98 : 4,018.76 = 1,918.74 : x
  2. Step 2: Convert to fraction form
    2,912.98/4,018.76 = 1,918.74/x
  3. Step 3: Cross multiply
    2,912.98x = 4,018.76 × 1,918.74
  4. Step 4: Simplify right side
    2,912.98x = 7,710,955.56
  5. Step 5: Solve for x
    x = 7,710,955.56/2,912.98
  6. Step 6: Final answer
    x = 2,647.10

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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.