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Finding the Fourth Proportional to 1,256.93, 1,886.51 and 672.42

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Solution

The fourth proportional to 1,256.93, 1,886.51 and 672.42 is: 1,009.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.93 : 1,886.51 = 672.42 : x
  2. Step 2: Convert to fraction form
    1,256.93/1,886.51 = 672.42/x
  3. Step 3: Cross multiply
    1,256.93x = 1,886.51 × 672.42
  4. Step 4: Simplify right side
    1,256.93x = 1,268,527.05
  5. Step 5: Solve for x
    x = 1,268,527.05/1,256.93
  6. Step 6: Final answer
    x = 1,009.23

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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.