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Finding the Fourth Proportional to 1,215.63, 1,823.64 and 393.84

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Solution

The fourth proportional to 1,215.63, 1,823.64 and 393.84 is: 590.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.63 : 1,823.64 = 393.84 : x
  2. Step 2: Convert to fraction form
    1,215.63/1,823.64 = 393.84/x
  3. Step 3: Cross multiply
    1,215.63x = 1,823.64 × 393.84
  4. Step 4: Simplify right side
    1,215.63x = 718,222.38
  5. Step 5: Solve for x
    x = 718,222.38/1,215.63
  6. Step 6: Final answer
    x = 590.82

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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.