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Finding the Fourth Proportional to 469.50, 647.18 and 321.90

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Solution

The fourth proportional to 469.50, 647.18 and 321.90 is: 443.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    469.50 : 647.18 = 321.90 : x
  2. Step 2: Convert to fraction form
    469.50/647.18 = 321.90/x
  3. Step 3: Cross multiply
    469.50x = 647.18 × 321.90
  4. Step 4: Simplify right side
    469.50x = 208,327.24
  5. Step 5: Solve for x
    x = 208,327.24/469.50
  6. Step 6: Final answer
    x = 443.72

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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.