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Finding the Fourth Proportional to 1,292.22, 1,938.31 and 318.32

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Solution

The fourth proportional to 1,292.22, 1,938.31 and 318.32 is: 477.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.22 : 1,938.31 = 318.32 : x
  2. Step 2: Convert to fraction form
    1,292.22/1,938.31 = 318.32/x
  3. Step 3: Cross multiply
    1,292.22x = 1,938.31 × 318.32
  4. Step 4: Simplify right side
    1,292.22x = 617,012.31
  5. Step 5: Solve for x
    x = 617,012.31/1,292.22
  6. Step 6: Final answer
    x = 477.48

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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.