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Finding the Fourth Proportional to 487.95, 673.19 and 310.88

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Solution

The fourth proportional to 487.95, 673.19 and 310.88 is: 428.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.95 : 673.19 = 310.88 : x
  2. Step 2: Convert to fraction form
    487.95/673.19 = 310.88/x
  3. Step 3: Cross multiply
    487.95x = 673.19 × 310.88
  4. Step 4: Simplify right side
    487.95x = 209,282.99
  5. Step 5: Solve for x
    x = 209,282.99/487.95
  6. Step 6: Final answer
    x = 428.90

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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.