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Finding the Fourth Proportional to 618.55, 928.08 and 289.25

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Solution

The fourth proportional to 618.55, 928.08 and 289.25 is: 433.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.55 : 928.08 = 289.25 : x
  2. Step 2: Convert to fraction form
    618.55/928.08 = 289.25/x
  3. Step 3: Cross multiply
    618.55x = 928.08 × 289.25
  4. Step 4: Simplify right side
    618.55x = 268,447.06
  5. Step 5: Solve for x
    x = 268,447.06/618.55
  6. Step 6: Final answer
    x = 433.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.