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Finding the Fourth Proportional to 1,287.96, 1,933.58 and 672.08

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Solution

The fourth proportional to 1,287.96, 1,933.58 and 672.08 is: 1,008.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,287.96 : 1,933.58 = 672.08 : x
  2. Step 2: Convert to fraction form
    1,287.96/1,933.58 = 672.08/x
  3. Step 3: Cross multiply
    1,287.96x = 1,933.58 × 672.08
  4. Step 4: Simplify right side
    1,287.96x = 1,299,520.45
  5. Step 5: Solve for x
    x = 1,299,520.45/1,287.96
  6. Step 6: Final answer
    x = 1,008.98

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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.