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Finding the Fourth Proportional to 822.93, 1,235.03 and 390.39

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Solution

The fourth proportional to 822.93, 1,235.03 and 390.39 is: 585.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.93 : 1,235.03 = 390.39 : x
  2. Step 2: Convert to fraction form
    822.93/1,235.03 = 390.39/x
  3. Step 3: Cross multiply
    822.93x = 1,235.03 × 390.39
  4. Step 4: Simplify right side
    822.93x = 482,143.36
  5. Step 5: Solve for x
    x = 482,143.36/822.93
  6. Step 6: Final answer
    x = 585.89

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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.