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Finding the Fourth Proportional to 618.92, 854.56 and 478.84

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Solution

The fourth proportional to 618.92, 854.56 and 478.84 is: 661.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.92 : 854.56 = 478.84 : x
  2. Step 2: Convert to fraction form
    618.92/854.56 = 478.84/x
  3. Step 3: Cross multiply
    618.92x = 854.56 × 478.84
  4. Step 4: Simplify right side
    618.92x = 409,197.51
  5. Step 5: Solve for x
    x = 409,197.51/618.92
  6. Step 6: Final answer
    x = 661.15

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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.