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Finding the Fourth Proportional to 827.84, 1,239.68 and 553.16

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Solution

The fourth proportional to 827.84, 1,239.68 and 553.16 is: 828.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.84 : 1,239.68 = 553.16 : x
  2. Step 2: Convert to fraction form
    827.84/1,239.68 = 553.16/x
  3. Step 3: Cross multiply
    827.84x = 1,239.68 × 553.16
  4. Step 4: Simplify right side
    827.84x = 685,741.39
  5. Step 5: Solve for x
    x = 685,741.39/827.84
  6. Step 6: Final answer
    x = 828.35

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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.