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Finding the Fourth Proportional to 673.91, 930.03 and 390.41

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Solution

The fourth proportional to 673.91, 930.03 and 390.41 is: 538.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    673.91 : 930.03 = 390.41 : x
  2. Step 2: Convert to fraction form
    673.91/930.03 = 390.41/x
  3. Step 3: Cross multiply
    673.91x = 930.03 × 390.41
  4. Step 4: Simplify right side
    673.91x = 363,088.36
  5. Step 5: Solve for x
    x = 363,088.36/673.91
  6. Step 6: Final answer
    x = 538.78

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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.