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Finding the Fourth Proportional to 2,078.80, 3,118.80 and 617.98

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Solution

The fourth proportional to 2,078.80, 3,118.80 and 617.98 is: 927.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,078.80 : 3,118.80 = 617.98 : x
  2. Step 2: Convert to fraction form
    2,078.80/3,118.80 = 617.98/x
  3. Step 3: Cross multiply
    2,078.80x = 3,118.80 × 617.98
  4. Step 4: Simplify right side
    2,078.80x = 1,927,356.02
  5. Step 5: Solve for x
    x = 1,927,356.02/2,078.80
  6. Step 6: Final answer
    x = 927.15

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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.