Home / 21,488.72-29,643.24-13,515.92

Finding the Fourth Proportional to 21,488.72, 29,643.24 and 13,515.92

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Solution

The fourth proportional to 21,488.72, 29,643.24 and 13,515.92 is: 18,644.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,488.72 : 29,643.24 = 13,515.92 : x
  2. Step 2: Convert to fraction form
    21,488.72/29,643.24 = 13,515.92/x
  3. Step 3: Cross multiply
    21,488.72x = 29,643.24 × 13,515.92
  4. Step 4: Simplify right side
    21,488.72x = 400,655,660.38
  5. Step 5: Solve for x
    x = 400,655,660.38/21,488.72
  6. Step 6: Final answer
    x = 18,644.93

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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.