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Finding the Fourth Proportional to 828.08, 1,242.71 and 670.16

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Solution

The fourth proportional to 828.08, 1,242.71 and 670.16 is: 1,005.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.08 : 1,242.71 = 670.16 : x
  2. Step 2: Convert to fraction form
    828.08/1,242.71 = 670.16/x
  3. Step 3: Cross multiply
    828.08x = 1,242.71 × 670.16
  4. Step 4: Simplify right side
    828.08x = 832,804.97
  5. Step 5: Solve for x
    x = 832,804.97/828.08
  6. Step 6: Final answer
    x = 1,005.71

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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.