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Finding the Fourth Proportional to 1,370.85, 1,892.07 and 839.58

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Solution

The fourth proportional to 1,370.85, 1,892.07 and 839.58 is: 1,158.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.85 : 1,892.07 = 839.58 : x
  2. Step 2: Convert to fraction form
    1,370.85/1,892.07 = 839.58/x
  3. Step 3: Cross multiply
    1,370.85x = 1,892.07 × 839.58
  4. Step 4: Simplify right side
    1,370.85x = 1,588,544.13
  5. Step 5: Solve for x
    x = 1,588,544.13/1,370.85
  6. Step 6: Final answer
    x = 1,158.80

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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.