Home / 21,618.81-29,829.40-13,125.37

Finding the Fourth Proportional to 21,618.81, 29,829.40 and 13,125.37

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Solution

The fourth proportional to 21,618.81, 29,829.40 and 13,125.37 is: 18,110.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,618.81 : 29,829.40 = 13,125.37 : x
  2. Step 2: Convert to fraction form
    21,618.81/29,829.40 = 13,125.37/x
  3. Step 3: Cross multiply
    21,618.81x = 29,829.40 × 13,125.37
  4. Step 4: Simplify right side
    21,618.81x = 391,521,911.88
  5. Step 5: Solve for x
    x = 391,521,911.88/21,618.81
  6. Step 6: Final answer
    x = 18,110.24

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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.