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Finding the Fourth Proportional to 1,328.48, 1,996.50 and 780.74

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Solution

The fourth proportional to 1,328.48, 1,996.50 and 780.74 is: 1,173.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.48 : 1,996.50 = 780.74 : x
  2. Step 2: Convert to fraction form
    1,328.48/1,996.50 = 780.74/x
  3. Step 3: Cross multiply
    1,328.48x = 1,996.50 × 780.74
  4. Step 4: Simplify right side
    1,328.48x = 1,558,747.41
  5. Step 5: Solve for x
    x = 1,558,747.41/1,328.48
  6. Step 6: Final answer
    x = 1,173.33

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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.