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Finding the Fourth Proportional to 2,487.21, 3,730.58 and 638.28

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Solution

The fourth proportional to 2,487.21, 3,730.58 and 638.28 is: 957.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,487.21 : 3,730.58 = 638.28 : x
  2. Step 2: Convert to fraction form
    2,487.21/3,730.58 = 638.28/x
  3. Step 3: Cross multiply
    2,487.21x = 3,730.58 × 638.28
  4. Step 4: Simplify right side
    2,487.21x = 2,381,154.60
  5. Step 5: Solve for x
    x = 2,381,154.60/2,487.21
  6. Step 6: Final answer
    x = 957.36

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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.