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Finding the Fourth Proportional to 1,003.64, 1,504.40 and 638.66

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Solution

The fourth proportional to 1,003.64, 1,504.40 and 638.66 is: 957.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.64 : 1,504.40 = 638.66 : x
  2. Step 2: Convert to fraction form
    1,003.64/1,504.40 = 638.66/x
  3. Step 3: Cross multiply
    1,003.64x = 1,504.40 × 638.66
  4. Step 4: Simplify right side
    1,003.64x = 960,800.10
  5. Step 5: Solve for x
    x = 960,800.10/1,003.64
  6. Step 6: Final answer
    x = 957.32

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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.