Home / 1,312.26-1,968.39-387.83

Finding the Fourth Proportional to 1,312.26, 1,968.39 and 387.83

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Solution

The fourth proportional to 1,312.26, 1,968.39 and 387.83 is: 581.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,312.26 : 1,968.39 = 387.83 : x
  2. Step 2: Convert to fraction form
    1,312.26/1,968.39 = 387.83/x
  3. Step 3: Cross multiply
    1,312.26x = 1,968.39 × 387.83
  4. Step 4: Simplify right side
    1,312.26x = 763,390.85
  5. Step 5: Solve for x
    x = 763,390.85/1,312.26
  6. Step 6: Final answer
    x = 581.74

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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.