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Finding the Fourth Proportional to 618.95, 854.12 and 353.43

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Solution

The fourth proportional to 618.95, 854.12 and 353.43 is: 487.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.95 : 854.12 = 353.43 : x
  2. Step 2: Convert to fraction form
    618.95/854.12 = 353.43/x
  3. Step 3: Cross multiply
    618.95x = 854.12 × 353.43
  4. Step 4: Simplify right side
    618.95x = 301,872.52
  5. Step 5: Solve for x
    x = 301,872.52/618.95
  6. Step 6: Final answer
    x = 487.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.