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Finding the Fourth Proportional to 2,379.42, 3,569.31 and 648

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Solution

The fourth proportional to 2,379.42, 3,569.31 and 648 is: 972.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,379.42 : 3,569.31 = 648 : x
  2. Step 2: Convert to fraction form
    2,379.42/3,569.31 = 648/x
  3. Step 3: Cross multiply
    2,379.42x = 3,569.31 × 648
  4. Step 4: Simplify right side
    2,379.42x = 2,312,912.88
  5. Step 5: Solve for x
    x = 2,312,912.88/2,379.42
  6. Step 6: Final answer
    x = 972.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.