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Finding the Fourth Proportional to 1,086.88, 1,630.18 and 437.64

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Solution

The fourth proportional to 1,086.88, 1,630.18 and 437.64 is: 656.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,086.88 : 1,630.18 = 437.64 : x
  2. Step 2: Convert to fraction form
    1,086.88/1,630.18 = 437.64/x
  3. Step 3: Cross multiply
    1,086.88x = 1,630.18 × 437.64
  4. Step 4: Simplify right side
    1,086.88x = 713,431.98
  5. Step 5: Solve for x
    x = 713,431.98/1,086.88
  6. Step 6: Final answer
    x = 656.40

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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.