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Finding the Fourth Proportional to 1,379.87, 1,903.99 and 790.45

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Solution

The fourth proportional to 1,379.87, 1,903.99 and 790.45 is: 1,090.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.87 : 1,903.99 = 790.45 : x
  2. Step 2: Convert to fraction form
    1,379.87/1,903.99 = 790.45/x
  3. Step 3: Cross multiply
    1,379.87x = 1,903.99 × 790.45
  4. Step 4: Simplify right side
    1,379.87x = 1,505,008.90
  5. Step 5: Solve for x
    x = 1,505,008.90/1,379.87
  6. Step 6: Final answer
    x = 1,090.69

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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.