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Finding the Fourth Proportional to 2,672.79, 3,686.47 and 1,929.21

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Solution

The fourth proportional to 2,672.79, 3,686.47 and 1,929.21 is: 2,660.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,672.79 : 3,686.47 = 1,929.21 : x
  2. Step 2: Convert to fraction form
    2,672.79/3,686.47 = 1,929.21/x
  3. Step 3: Cross multiply
    2,672.79x = 3,686.47 × 1,929.21
  4. Step 4: Simplify right side
    2,672.79x = 7,111,974.79
  5. Step 5: Solve for x
    x = 7,111,974.79/2,672.79
  6. Step 6: Final answer
    x = 2,660.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.