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Finding the Fourth Proportional to 989.70, 1,362.33 and 903.30

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Solution

The fourth proportional to 989.70, 1,362.33 and 903.30 is: 1,243.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.70 : 1,362.33 = 903.30 : x
  2. Step 2: Convert to fraction form
    989.70/1,362.33 = 903.30/x
  3. Step 3: Cross multiply
    989.70x = 1,362.33 × 903.30
  4. Step 4: Simplify right side
    989.70x = 1,230,592.69
  5. Step 5: Solve for x
    x = 1,230,592.69/989.70
  6. Step 6: Final answer
    x = 1,243.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.