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Finding the Fourth Proportional to 1,003.76, 1,506.63 and 638.81

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Solution

The fourth proportional to 1,003.76, 1,506.63 and 638.81 is: 958.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,003.76 : 1,506.63 = 638.81 : x
  2. Step 2: Convert to fraction form
    1,003.76/1,506.63 = 638.81/x
  3. Step 3: Cross multiply
    1,003.76x = 1,506.63 × 638.81
  4. Step 4: Simplify right side
    1,003.76x = 962,439.58
  5. Step 5: Solve for x
    x = 962,439.58/1,003.76
  6. Step 6: Final answer
    x = 958.83

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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.