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Finding the Fourth Proportional to 1,330.79, 1,991.33 and 783.23

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Solution

The fourth proportional to 1,330.79, 1,991.33 and 783.23 is: 1,171.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.79 : 1,991.33 = 783.23 : x
  2. Step 2: Convert to fraction form
    1,330.79/1,991.33 = 783.23/x
  3. Step 3: Cross multiply
    1,330.79x = 1,991.33 × 783.23
  4. Step 4: Simplify right side
    1,330.79x = 1,559,665.48
  5. Step 5: Solve for x
    x = 1,559,665.48/1,330.79
  6. Step 6: Final answer
    x = 1,171.98

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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.