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Finding the Fourth Proportional to 988.81, 1,484.31 and 676.69

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Solution

The fourth proportional to 988.81, 1,484.31 and 676.69 is: 1,015.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.81 : 1,484.31 = 676.69 : x
  2. Step 2: Convert to fraction form
    988.81/1,484.31 = 676.69/x
  3. Step 3: Cross multiply
    988.81x = 1,484.31 × 676.69
  4. Step 4: Simplify right side
    988.81x = 1,004,417.73
  5. Step 5: Solve for x
    x = 1,004,417.73/988.81
  6. Step 6: Final answer
    x = 1,015.78

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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.