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Finding the Fourth Proportional to 618.48, 929.40 and 455.64

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Solution

The fourth proportional to 618.48, 929.40 and 455.64 is: 684.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.48 : 929.40 = 455.64 : x
  2. Step 2: Convert to fraction form
    618.48/929.40 = 455.64/x
  3. Step 3: Cross multiply
    618.48x = 929.40 × 455.64
  4. Step 4: Simplify right side
    618.48x = 423,471.82
  5. Step 5: Solve for x
    x = 423,471.82/618.48
  6. Step 6: Final answer
    x = 684.70

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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.