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Finding the Fourth Proportional to 873.96, 1,206.42 and 664.18

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Solution

The fourth proportional to 873.96, 1,206.42 and 664.18 is: 916.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.96 : 1,206.42 = 664.18 : x
  2. Step 2: Convert to fraction form
    873.96/1,206.42 = 664.18/x
  3. Step 3: Cross multiply
    873.96x = 1,206.42 × 664.18
  4. Step 4: Simplify right side
    873.96x = 801,280.04
  5. Step 5: Solve for x
    x = 801,280.04/873.96
  6. Step 6: Final answer
    x = 916.84

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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.