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Finding the Fourth Proportional to 1,004.21, 1,505.50 and 387.59

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Solution

The fourth proportional to 1,004.21, 1,505.50 and 387.59 is: 581.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.21 : 1,505.50 = 387.59 : x
  2. Step 2: Convert to fraction form
    1,004.21/1,505.50 = 387.59/x
  3. Step 3: Cross multiply
    1,004.21x = 1,505.50 × 387.59
  4. Step 4: Simplify right side
    1,004.21x = 583,519.54
  5. Step 5: Solve for x
    x = 583,519.54/1,004.21
  6. Step 6: Final answer
    x = 581.08

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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.