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Finding the Fourth Proportional to 981.03, 1,353.78 and 538.91

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Solution

The fourth proportional to 981.03, 1,353.78 and 538.91 is: 743.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.03 : 1,353.78 = 538.91 : x
  2. Step 2: Convert to fraction form
    981.03/1,353.78 = 538.91/x
  3. Step 3: Cross multiply
    981.03x = 1,353.78 × 538.91
  4. Step 4: Simplify right side
    981.03x = 729,558.81
  5. Step 5: Solve for x
    x = 729,558.81/981.03
  6. Step 6: Final answer
    x = 743.67

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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.