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Finding the Fourth Proportional to 999.83, 1,379.80 and 551.73

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Solution

The fourth proportional to 999.83, 1,379.80 and 551.73 is: 761.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.83 : 1,379.80 = 551.73 : x
  2. Step 2: Convert to fraction form
    999.83/1,379.80 = 551.73/x
  3. Step 3: Cross multiply
    999.83x = 1,379.80 × 551.73
  4. Step 4: Simplify right side
    999.83x = 761,270.16
  5. Step 5: Solve for x
    x = 761,270.16/999.83
  6. Step 6: Final answer
    x = 761.40

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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.