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Finding the Fourth Proportional to 1,004.80, 1,387.23 and 656.09

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Solution

The fourth proportional to 1,004.80, 1,387.23 and 656.09 is: 905.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.80 : 1,387.23 = 656.09 : x
  2. Step 2: Convert to fraction form
    1,004.80/1,387.23 = 656.09/x
  3. Step 3: Cross multiply
    1,004.80x = 1,387.23 × 656.09
  4. Step 4: Simplify right side
    1,004.80x = 910,147.73
  5. Step 5: Solve for x
    x = 910,147.73/1,004.80
  6. Step 6: Final answer
    x = 905.80

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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.