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Finding the Fourth Proportional to 1,004.12, 1,505.64 and 426.68

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Solution

The fourth proportional to 1,004.12, 1,505.64 and 426.68 is: 639.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.12 : 1,505.64 = 426.68 : x
  2. Step 2: Convert to fraction form
    1,004.12/1,505.64 = 426.68/x
  3. Step 3: Cross multiply
    1,004.12x = 1,505.64 × 426.68
  4. Step 4: Simplify right side
    1,004.12x = 642,426.48
  5. Step 5: Solve for x
    x = 642,426.48/1,004.12
  6. Step 6: Final answer
    x = 639.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.