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Finding the Fourth Proportional to 1,348.63, 1,861.71 and 999.92

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Solution

The fourth proportional to 1,348.63, 1,861.71 and 999.92 is: 1,380.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,348.63 : 1,861.71 = 999.92 : x
  2. Step 2: Convert to fraction form
    1,348.63/1,861.71 = 999.92/x
  3. Step 3: Cross multiply
    1,348.63x = 1,861.71 × 999.92
  4. Step 4: Simplify right side
    1,348.63x = 1,861,561.06
  5. Step 5: Solve for x
    x = 1,861,561.06/1,348.63
  6. Step 6: Final answer
    x = 1,380.34

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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.