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Finding the Fourth Proportional to 418.68, 624.33 and 389.46

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Solution

The fourth proportional to 418.68, 624.33 and 389.46 is: 580.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.68 : 624.33 = 389.46 : x
  2. Step 2: Convert to fraction form
    418.68/624.33 = 389.46/x
  3. Step 3: Cross multiply
    418.68x = 624.33 × 389.46
  4. Step 4: Simplify right side
    418.68x = 243,149.02
  5. Step 5: Solve for x
    x = 243,149.02/418.68
  6. Step 6: Final answer
    x = 580.76

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.