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Finding the Fourth Proportional to 998.19, 1,495.67 and 631.80

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Solution

The fourth proportional to 998.19, 1,495.67 and 631.80 is: 946.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    998.19 : 1,495.67 = 631.80 : x
  2. Step 2: Convert to fraction form
    998.19/1,495.67 = 631.80/x
  3. Step 3: Cross multiply
    998.19x = 1,495.67 × 631.80
  4. Step 4: Simplify right side
    998.19x = 944,961.15
  5. Step 5: Solve for x
    x = 944,961.15/998.19
  6. Step 6: Final answer
    x = 946.67

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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.