Home / 1,292.40-1,938.58-318.49

Finding the Fourth Proportional to 1,292.40, 1,938.58 and 318.49

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Solution

The fourth proportional to 1,292.40, 1,938.58 and 318.49 is: 477.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.40 : 1,938.58 = 318.49 : x
  2. Step 2: Convert to fraction form
    1,292.40/1,938.58 = 318.49/x
  3. Step 3: Cross multiply
    1,292.40x = 1,938.58 × 318.49
  4. Step 4: Simplify right side
    1,292.40x = 617,418.34
  5. Step 5: Solve for x
    x = 617,418.34/1,292.40
  6. Step 6: Final answer
    x = 477.73

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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.