Home / 1,292.85-1,938.13-513.40

Finding the Fourth Proportional to 1,292.85, 1,938.13 and 513.40

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Solution

The fourth proportional to 1,292.85, 1,938.13 and 513.40 is: 769.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,292.85 : 1,938.13 = 513.40 : x
  2. Step 2: Convert to fraction form
    1,292.85/1,938.13 = 513.40/x
  3. Step 3: Cross multiply
    1,292.85x = 1,938.13 × 513.40
  4. Step 4: Simplify right side
    1,292.85x = 995,029.32
  5. Step 5: Solve for x
    x = 995,029.32/1,292.85
  6. Step 6: Final answer
    x = 769.64

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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.