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Finding the Fourth Proportional to 1,403.96, 1,937.20 and 879.69

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Solution

The fourth proportional to 1,403.96, 1,937.20 and 879.69 is: 1,213.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.96 : 1,937.20 = 879.69 : x
  2. Step 2: Convert to fraction form
    1,403.96/1,937.20 = 879.69/x
  3. Step 3: Cross multiply
    1,403.96x = 1,937.20 × 879.69
  4. Step 4: Simplify right side
    1,403.96x = 1,704,131.07
  5. Step 5: Solve for x
    x = 1,704,131.07/1,403.96
  6. Step 6: Final answer
    x = 1,213.80

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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.