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Finding the Fourth Proportional to 2,118.97, 3,178.55 and 657.93

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Solution

The fourth proportional to 2,118.97, 3,178.55 and 657.93 is: 986.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,118.97 : 3,178.55 = 657.93 : x
  2. Step 2: Convert to fraction form
    2,118.97/3,178.55 = 657.93/x
  3. Step 3: Cross multiply
    2,118.97x = 3,178.55 × 657.93
  4. Step 4: Simplify right side
    2,118.97x = 2,091,265.05
  5. Step 5: Solve for x
    x = 2,091,265.05/2,118.97
  6. Step 6: Final answer
    x = 986.93

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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.