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Finding the Fourth Proportional to 487.55, 673.50 and 389.18

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Solution

The fourth proportional to 487.55, 673.50 and 389.18 is: 537.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.55 : 673.50 = 389.18 : x
  2. Step 2: Convert to fraction form
    487.55/673.50 = 389.18/x
  3. Step 3: Cross multiply
    487.55x = 673.50 × 389.18
  4. Step 4: Simplify right side
    487.55x = 262,109.36
  5. Step 5: Solve for x
    x = 262,109.36/487.55
  6. Step 6: Final answer
    x = 537.61

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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.