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Finding the Fourth Proportional to 487.95, 673.50 and 310.92

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Solution

The fourth proportional to 487.95, 673.50 and 310.92 is: 429.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.95 : 673.50 = 310.92 : x
  2. Step 2: Convert to fraction form
    487.95/673.50 = 310.92/x
  3. Step 3: Cross multiply
    487.95x = 673.50 × 310.92
  4. Step 4: Simplify right side
    487.95x = 209,403.26
  5. Step 5: Solve for x
    x = 209,403.26/487.95
  6. Step 6: Final answer
    x = 429.15

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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.