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Finding the Fourth Proportional to 1,419.11, 1,957.02 and 921.18

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Solution

The fourth proportional to 1,419.11, 1,957.02 and 921.18 is: 1,270.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,419.11 : 1,957.02 = 921.18 : x
  2. Step 2: Convert to fraction form
    1,419.11/1,957.02 = 921.18/x
  3. Step 3: Cross multiply
    1,419.11x = 1,957.02 × 921.18
  4. Step 4: Simplify right side
    1,419.11x = 1,802,767.68
  5. Step 5: Solve for x
    x = 1,802,767.68/1,419.11
  6. Step 6: Final answer
    x = 1,270.36

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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.