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Finding the Fourth Proportional to 618.95, 928.29 and 289.69

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Solution

The fourth proportional to 618.95, 928.29 and 289.69 is: 434.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.95 : 928.29 = 289.69 : x
  2. Step 2: Convert to fraction form
    618.95/928.29 = 289.69/x
  3. Step 3: Cross multiply
    618.95x = 928.29 × 289.69
  4. Step 4: Simplify right side
    618.95x = 268,915.10
  5. Step 5: Solve for x
    x = 268,915.10/618.95
  6. Step 6: Final answer
    x = 434.47

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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.