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Finding the Fourth Proportional to 469.95, 647.85 and 329.65

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Solution

The fourth proportional to 469.95, 647.85 and 329.65 is: 454.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.95 : 647.85 = 329.65 : x
  2. Step 2: Convert to fraction form
    469.95/647.85 = 329.65/x
  3. Step 3: Cross multiply
    469.95x = 647.85 × 329.65
  4. Step 4: Simplify right side
    469.95x = 213,558.87
  5. Step 5: Solve for x
    x = 213,558.87/469.95
  6. Step 6: Final answer
    x = 454.43

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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.