Home / 21,185.79-29,228.58-12,688.08

Finding the Fourth Proportional to 21,185.79, 29,228.58 and 12,688.08

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Solution

The fourth proportional to 21,185.79, 29,228.58 and 12,688.08 is: 17,504.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,185.79 : 29,228.58 = 12,688.08 : x
  2. Step 2: Convert to fraction form
    21,185.79/29,228.58 = 12,688.08/x
  3. Step 3: Cross multiply
    21,185.79x = 29,228.58 × 12,688.08
  4. Step 4: Simplify right side
    21,185.79x = 370,854,561.33
  5. Step 5: Solve for x
    x = 370,854,561.33/21,185.79
  6. Step 6: Final answer
    x = 17,504.87

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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.