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Finding the Fourth Proportional to 469.57, 647.40 and 321.94

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Solution

The fourth proportional to 469.57, 647.40 and 321.94 is: 443.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.57 : 647.40 = 321.94 : x
  2. Step 2: Convert to fraction form
    469.57/647.40 = 321.94/x
  3. Step 3: Cross multiply
    469.57x = 647.40 × 321.94
  4. Step 4: Simplify right side
    469.57x = 208,423.96
  5. Step 5: Solve for x
    x = 208,423.96/469.57
  6. Step 6: Final answer
    x = 443.86

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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.