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Finding the Fourth Proportional to 999.09, 1,378.67 and 550.89

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Solution

The fourth proportional to 999.09, 1,378.67 and 550.89 is: 760.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.09 : 1,378.67 = 550.89 : x
  2. Step 2: Convert to fraction form
    999.09/1,378.67 = 550.89/x
  3. Step 3: Cross multiply
    999.09x = 1,378.67 × 550.89
  4. Step 4: Simplify right side
    999.09x = 759,492.76
  5. Step 5: Solve for x
    x = 759,492.76/999.09
  6. Step 6: Final answer
    x = 760.18

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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.