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Finding the Fourth Proportional to 1,003.35, 1,505.57 and 638.31

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Solution

The fourth proportional to 1,003.35, 1,505.57 and 638.31 is: 957.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.35 : 1,505.57 = 638.31 : x
  2. Step 2: Convert to fraction form
    1,003.35/1,505.57 = 638.31/x
  3. Step 3: Cross multiply
    1,003.35x = 1,505.57 × 638.31
  4. Step 4: Simplify right side
    1,003.35x = 961,017.20
  5. Step 5: Solve for x
    x = 961,017.20/1,003.35
  6. Step 6: Final answer
    x = 957.81

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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.