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Finding the Fourth Proportional to 828.14, 1,242.18 and 807.48

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Solution

The fourth proportional to 828.14, 1,242.18 and 807.48 is: 1,211.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.14 : 1,242.18 = 807.48 : x
  2. Step 2: Convert to fraction form
    828.14/1,242.18 = 807.48/x
  3. Step 3: Cross multiply
    828.14x = 1,242.18 × 807.48
  4. Step 4: Simplify right side
    828.14x = 1,003,035.51
  5. Step 5: Solve for x
    x = 1,003,035.51/828.14
  6. Step 6: Final answer
    x = 1,211.19

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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.