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Finding the Fourth Proportional to 3,658.64, 5,487.84 and 1,318.88

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Solution

The fourth proportional to 3,658.64, 5,487.84 and 1,318.88 is: 1,978.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,658.64 : 5,487.84 = 1,318.88 : x
  2. Step 2: Convert to fraction form
    3,658.64/5,487.84 = 1,318.88/x
  3. Step 3: Cross multiply
    3,658.64x = 5,487.84 × 1,318.88
  4. Step 4: Simplify right side
    3,658.64x = 7,237,802.42
  5. Step 5: Solve for x
    x = 7,237,802.42/3,658.64
  6. Step 6: Final answer
    x = 1,978.28

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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.