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Finding the Fourth Proportional to 827.85, 1,142.40 and 454.83

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Solution

The fourth proportional to 827.85, 1,142.40 and 454.83 is: 627.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.85 : 1,142.40 = 454.83 : x
  2. Step 2: Convert to fraction form
    827.85/1,142.40 = 454.83/x
  3. Step 3: Cross multiply
    827.85x = 1,142.40 × 454.83
  4. Step 4: Simplify right side
    827.85x = 519,597.79
  5. Step 5: Solve for x
    x = 519,597.79/827.85
  6. Step 6: Final answer
    x = 627.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.