Home / 21,127.87-29,118.36-18,708.81

Finding the Fourth Proportional to 21,127.87, 29,118.36 and 18,708.81

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Solution

The fourth proportional to 21,127.87, 29,118.36 and 18,708.81 is: 25,784.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,127.87 : 29,118.36 = 18,708.81 : x
  2. Step 2: Convert to fraction form
    21,127.87/29,118.36 = 18,708.81/x
  3. Step 3: Cross multiply
    21,127.87x = 29,118.36 × 18,708.81
  4. Step 4: Simplify right side
    21,127.87x = 544,769,864.75
  5. Step 5: Solve for x
    x = 544,769,864.75/21,127.87
  6. Step 6: Final answer
    x = 25,784.42

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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.