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Finding the Fourth Proportional to 618.90, 928.71 and 253.95

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Solution

The fourth proportional to 618.90, 928.71 and 253.95 is: 381.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.90 : 928.71 = 253.95 : x
  2. Step 2: Convert to fraction form
    618.90/928.71 = 253.95/x
  3. Step 3: Cross multiply
    618.90x = 928.71 × 253.95
  4. Step 4: Simplify right side
    618.90x = 235,845.90
  5. Step 5: Solve for x
    x = 235,845.90/618.90
  6. Step 6: Final answer
    x = 381.07

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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.