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Finding the Fourth Proportional to 873.42, 1,205.70 and 663.63

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Solution

The fourth proportional to 873.42, 1,205.70 and 663.63 is: 916.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.42 : 1,205.70 = 663.63 : x
  2. Step 2: Convert to fraction form
    873.42/1,205.70 = 663.63/x
  3. Step 3: Cross multiply
    873.42x = 1,205.70 × 663.63
  4. Step 4: Simplify right side
    873.42x = 800,138.69
  5. Step 5: Solve for x
    x = 800,138.69/873.42
  6. Step 6: Final answer
    x = 916.10

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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.