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Finding the Fourth Proportional to 1,203.36, 1,660.80 and 731.45

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Solution

The fourth proportional to 1,203.36, 1,660.80 and 731.45 is: 1,009.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,203.36 : 1,660.80 = 731.45 : x
  2. Step 2: Convert to fraction form
    1,203.36/1,660.80 = 731.45/x
  3. Step 3: Cross multiply
    1,203.36x = 1,660.80 × 731.45
  4. Step 4: Simplify right side
    1,203.36x = 1,214,783.86
  5. Step 5: Solve for x
    x = 1,214,783.86/1,203.36
  6. Step 6: Final answer
    x = 1,009.49

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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.