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Finding the Fourth Proportional to 1,377.33, 1,900.80 and 817.74

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Solution

The fourth proportional to 1,377.33, 1,900.80 and 817.74 is: 1,128.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,377.33 : 1,900.80 = 817.74 : x
  2. Step 2: Convert to fraction form
    1,377.33/1,900.80 = 817.74/x
  3. Step 3: Cross multiply
    1,377.33x = 1,900.80 × 817.74
  4. Step 4: Simplify right side
    1,377.33x = 1,554,360.19
  5. Step 5: Solve for x
    x = 1,554,360.19/1,377.33
  6. Step 6: Final answer
    x = 1,128.53

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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.