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Finding the Fourth Proportional to 1,890, 2,835.27 and 657.18

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Solution

The fourth proportional to 1,890, 2,835.27 and 657.18 is: 985.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,890 : 2,835.27 = 657.18 : x
  2. Step 2: Convert to fraction form
    1,890/2,835.27 = 657.18/x
  3. Step 3: Cross multiply
    1,890x = 2,835.27 × 657.18
  4. Step 4: Simplify right side
    1,890x = 1,863,282.74
  5. Step 5: Solve for x
    x = 1,863,282.74/1,890
  6. Step 6: Final answer
    x = 985.86

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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.