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Finding the Fourth Proportional to 827.75, 1,142.34 and 478.55

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Solution

The fourth proportional to 827.75, 1,142.34 and 478.55 is: 660.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    827.75 : 1,142.34 = 478.55 : x
  2. Step 2: Convert to fraction form
    827.75/1,142.34 = 478.55/x
  3. Step 3: Cross multiply
    827.75x = 1,142.34 × 478.55
  4. Step 4: Simplify right side
    827.75x = 546,666.81
  5. Step 5: Solve for x
    x = 546,666.81/827.75
  6. Step 6: Final answer
    x = 660.43

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1.5x scale

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.