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Finding the Fourth Proportional to 1,379.48, 1,903.05 and 819.64

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Solution

The fourth proportional to 1,379.48, 1,903.05 and 819.64 is: 1,130.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,379.48 : 1,903.05 = 819.64 : x
  2. Step 2: Convert to fraction form
    1,379.48/1,903.05 = 819.64/x
  3. Step 3: Cross multiply
    1,379.48x = 1,903.05 × 819.64
  4. Step 4: Simplify right side
    1,379.48x = 1,559,806.39
  5. Step 5: Solve for x
    x = 1,559,806.39/1,379.48
  6. Step 6: Final answer
    x = 1,130.72

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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.