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Finding the Fourth Proportional to 618.95, 928.78 and 254.00

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Solution

The fourth proportional to 618.95, 928.78 and 254.00 is: 381.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.95 : 928.78 = 254.00 : x
  2. Step 2: Convert to fraction form
    618.95/928.78 = 254.00/x
  3. Step 3: Cross multiply
    618.95x = 928.78 × 254.00
  4. Step 4: Simplify right side
    618.95x = 235,911.81
  5. Step 5: Solve for x
    x = 235,911.81/618.95
  6. Step 6: Final answer
    x = 381.15

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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.