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Finding the Fourth Proportional to 828.41, 1,142.37 and 641.57

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Solution

The fourth proportional to 828.41, 1,142.37 and 641.57 is: 884.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.41 : 1,142.37 = 641.57 : x
  2. Step 2: Convert to fraction form
    828.41/1,142.37 = 641.57/x
  3. Step 3: Cross multiply
    828.41x = 1,142.37 × 641.57
  4. Step 4: Simplify right side
    828.41x = 732,904.61
  5. Step 5: Solve for x
    x = 732,904.61/828.41
  6. Step 6: Final answer
    x = 884.72

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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.