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Finding the Fourth Proportional to 998.44, 1,495.38 and 478.81

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Solution

The fourth proportional to 998.44, 1,495.38 and 478.81 is: 717.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.44 : 1,495.38 = 478.81 : x
  2. Step 2: Convert to fraction form
    998.44/1,495.38 = 478.81/x
  3. Step 3: Cross multiply
    998.44x = 1,495.38 × 478.81
  4. Step 4: Simplify right side
    998.44x = 716,002.90
  5. Step 5: Solve for x
    x = 716,002.90/998.44
  6. Step 6: Final answer
    x = 717.12

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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.