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Finding the Fourth Proportional to 999.19, 1,379.18 and 705.31

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Solution

The fourth proportional to 999.19, 1,379.18 and 705.31 is: 973.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    999.19 : 1,379.18 = 705.31 : x
  2. Step 2: Convert to fraction form
    999.19/1,379.18 = 705.31/x
  3. Step 3: Cross multiply
    999.19x = 1,379.18 × 705.31
  4. Step 4: Simplify right side
    999.19x = 972,743.79
  5. Step 5: Solve for x
    x = 972,743.79/999.19
  6. Step 6: Final answer
    x = 973.54

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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.