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Finding the Fourth Proportional to 1,331.04, 1,991.70 and 783.48

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Solution

The fourth proportional to 1,331.04, 1,991.70 and 783.48 is: 1,172.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,331.04 : 1,991.70 = 783.48 : x
  2. Step 2: Convert to fraction form
    1,331.04/1,991.70 = 783.48/x
  3. Step 3: Cross multiply
    1,331.04x = 1,991.70 × 783.48
  4. Step 4: Simplify right side
    1,331.04x = 1,560,457.12
  5. Step 5: Solve for x
    x = 1,560,457.12/1,331.04
  6. Step 6: Final answer
    x = 1,172.36

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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.