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Finding the Fourth Proportional to 488.40, 673.97 and 278.56

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Solution

The fourth proportional to 488.40, 673.97 and 278.56 is: 384.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    488.40 : 673.97 = 278.56 : x
  2. Step 2: Convert to fraction form
    488.40/673.97 = 278.56/x
  3. Step 3: Cross multiply
    488.40x = 673.97 × 278.56
  4. Step 4: Simplify right side
    488.40x = 187,741.08
  5. Step 5: Solve for x
    x = 187,741.08/488.40
  6. Step 6: Final answer
    x = 384.40

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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.