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Finding the Fourth Proportional to 1,876.70, 2,814.80 and 490.15

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Solution

The fourth proportional to 1,876.70, 2,814.80 and 490.15 is: 735.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,876.70 : 2,814.80 = 490.15 : x
  2. Step 2: Convert to fraction form
    1,876.70/2,814.80 = 490.15/x
  3. Step 3: Cross multiply
    1,876.70x = 2,814.80 × 490.15
  4. Step 4: Simplify right side
    1,876.70x = 1,379,657.70
  5. Step 5: Solve for x
    x = 1,379,657.70/1,876.70
  6. Step 6: Final answer
    x = 735.15

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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.