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Finding the Fourth Proportional to 1,072.55, 1,479.34 and 673.90

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Solution

The fourth proportional to 1,072.55, 1,479.34 and 673.90 is: 929.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,072.55 : 1,479.34 = 673.90 : x
  2. Step 2: Convert to fraction form
    1,072.55/1,479.34 = 673.90/x
  3. Step 3: Cross multiply
    1,072.55x = 1,479.34 × 673.90
  4. Step 4: Simplify right side
    1,072.55x = 996,927.23
  5. Step 5: Solve for x
    x = 996,927.23/1,072.55
  6. Step 6: Final answer
    x = 929.49

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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.