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Finding the Fourth Proportional to 487.80, 673.12 and 278.03

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Solution

The fourth proportional to 487.80, 673.12 and 278.03 is: 383.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.80 : 673.12 = 278.03 : x
  2. Step 2: Convert to fraction form
    487.80/673.12 = 278.03/x
  3. Step 3: Cross multiply
    487.80x = 673.12 × 278.03
  4. Step 4: Simplify right side
    487.80x = 187,145.02
  5. Step 5: Solve for x
    x = 187,145.02/487.80
  6. Step 6: Final answer
    x = 383.65

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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.