Home / 1,292.29-1,938.47-318.39

Finding the Fourth Proportional to 1,292.29, 1,938.47 and 318.39

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Solution

The fourth proportional to 1,292.29, 1,938.47 and 318.39 is: 477.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.29 : 1,938.47 = 318.39 : x
  2. Step 2: Convert to fraction form
    1,292.29/1,938.47 = 318.39/x
  3. Step 3: Cross multiply
    1,292.29x = 1,938.47 × 318.39
  4. Step 4: Simplify right side
    1,292.29x = 617,189.46
  5. Step 5: Solve for x
    x = 617,189.46/1,292.29
  6. Step 6: Final answer
    x = 477.59

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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.