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Finding the Fourth Proportional to 871.62, 1,204.11 and 684.51

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Solution

The fourth proportional to 871.62, 1,204.11 and 684.51 is: 945.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    871.62 : 1,204.11 = 684.51 : x
  2. Step 2: Convert to fraction form
    871.62/1,204.11 = 684.51/x
  3. Step 3: Cross multiply
    871.62x = 1,204.11 × 684.51
  4. Step 4: Simplify right side
    871.62x = 824,225.34
  5. Step 5: Solve for x
    x = 824,225.34/871.62
  6. Step 6: Final answer
    x = 945.62

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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.