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Finding the Fourth Proportional to 663.84, 995.92 and 420.08

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Solution

The fourth proportional to 663.84, 995.92 and 420.08 is: 630.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.84 : 995.92 = 420.08 : x
  2. Step 2: Convert to fraction form
    663.84/995.92 = 420.08/x
  3. Step 3: Cross multiply
    663.84x = 995.92 × 420.08
  4. Step 4: Simplify right side
    663.84x = 418,366.07
  5. Step 5: Solve for x
    x = 418,366.07/663.84
  6. Step 6: Final answer
    x = 630.22

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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.