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Finding the Fourth Proportional to 1,215.68, 1,823.19 and 393.77

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Solution

The fourth proportional to 1,215.68, 1,823.19 and 393.77 is: 590.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.68 : 1,823.19 = 393.77 : x
  2. Step 2: Convert to fraction form
    1,215.68/1,823.19 = 393.77/x
  3. Step 3: Cross multiply
    1,215.68x = 1,823.19 × 393.77
  4. Step 4: Simplify right side
    1,215.68x = 717,908.41
  5. Step 5: Solve for x
    x = 717,908.41/1,215.68
  6. Step 6: Final answer
    x = 590.54

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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.