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Finding the Fourth Proportional to 943.40, 1,412.22 and 921.80

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Solution

The fourth proportional to 943.40, 1,412.22 and 921.80 is: 1,379.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    943.40 : 1,412.22 = 921.80 : x
  2. Step 2: Convert to fraction form
    943.40/1,412.22 = 921.80/x
  3. Step 3: Cross multiply
    943.40x = 1,412.22 × 921.80
  4. Step 4: Simplify right side
    943.40x = 1,301,784.40
  5. Step 5: Solve for x
    x = 1,301,784.40/943.40
  6. Step 6: Final answer
    x = 1,379.89

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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.