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Finding the Fourth Proportional to 1,076.43, 1,485.12 and 656.63

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Solution

The fourth proportional to 1,076.43, 1,485.12 and 656.63 is: 905.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,076.43 : 1,485.12 = 656.63 : x
  2. Step 2: Convert to fraction form
    1,076.43/1,485.12 = 656.63/x
  3. Step 3: Cross multiply
    1,076.43x = 1,485.12 × 656.63
  4. Step 4: Simplify right side
    1,076.43x = 975,177.28
  5. Step 5: Solve for x
    x = 975,177.28/1,076.43
  6. Step 6: Final answer
    x = 905.94

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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.