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Finding the Fourth Proportional to 2,752.28, 4,128.39 and 672.31

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Solution

The fourth proportional to 2,752.28, 4,128.39 and 672.31 is: 1,008.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,752.28 : 4,128.39 = 672.31 : x
  2. Step 2: Convert to fraction form
    2,752.28/4,128.39 = 672.31/x
  3. Step 3: Cross multiply
    2,752.28x = 4,128.39 × 672.31
  4. Step 4: Simplify right side
    2,752.28x = 2,775,570.74
  5. Step 5: Solve for x
    x = 2,775,570.74/2,752.28
  6. Step 6: Final answer
    x = 1,008.46

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1.5x scale

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.