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Finding the Fourth Proportional to 488.48, 673.72 and 390

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Solution

The fourth proportional to 488.48, 673.72 and 390 is: 537.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.48 : 673.72 = 390 : x
  2. Step 2: Convert to fraction form
    488.48/673.72 = 390/x
  3. Step 3: Cross multiply
    488.48x = 673.72 × 390
  4. Step 4: Simplify right side
    488.48x = 262,750.80
  5. Step 5: Solve for x
    x = 262,750.80/488.48
  6. Step 6: Final answer
    x = 537.89

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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.