Home / 21,125.79-29,127.13-13,558.77

Finding the Fourth Proportional to 21,125.79, 29,127.13 and 13,558.77

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Solution

The fourth proportional to 21,125.79, 29,127.13 and 13,558.77 is: 18,694.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,125.79 : 29,127.13 = 13,558.77 : x
  2. Step 2: Convert to fraction form
    21,125.79/29,127.13 = 13,558.77/x
  3. Step 3: Cross multiply
    21,125.79x = 29,127.13 × 13,558.77
  4. Step 4: Simplify right side
    21,125.79x = 394,928,022.53
  5. Step 5: Solve for x
    x = 394,928,022.53/21,125.79
  6. Step 6: Final answer
    x = 18,694.12

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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.