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Finding the Fourth Proportional to 1,055, 1,456.32 and 661.92

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Solution

The fourth proportional to 1,055, 1,456.32 and 661.92 is: 913.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,055 : 1,456.32 = 661.92 : x
  2. Step 2: Convert to fraction form
    1,055/1,456.32 = 661.92/x
  3. Step 3: Cross multiply
    1,055x = 1,456.32 × 661.92
  4. Step 4: Simplify right side
    1,055x = 963,967.33
  5. Step 5: Solve for x
    x = 963,967.33/1,055
  6. Step 6: Final answer
    x = 913.71

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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.