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Finding the Fourth Proportional to 488.97, 673.38 and 390.42

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Solution

The fourth proportional to 488.97, 673.38 and 390.42 is: 537.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.97 : 673.38 = 390.42 : x
  2. Step 2: Convert to fraction form
    488.97/673.38 = 390.42/x
  3. Step 3: Cross multiply
    488.97x = 673.38 × 390.42
  4. Step 4: Simplify right side
    488.97x = 262,901.02
  5. Step 5: Solve for x
    x = 262,901.02/488.97
  6. Step 6: Final answer
    x = 537.66

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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.