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Finding the Fourth Proportional to 430.12, 643.99 and 325.68

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Solution

The fourth proportional to 430.12, 643.99 and 325.68 is: 487.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.12 : 643.99 = 325.68 : x
  2. Step 2: Convert to fraction form
    430.12/643.99 = 325.68/x
  3. Step 3: Cross multiply
    430.12x = 643.99 × 325.68
  4. Step 4: Simplify right side
    430.12x = 209,734.66
  5. Step 5: Solve for x
    x = 209,734.66/430.12
  6. Step 6: Final answer
    x = 487.62

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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.