Home / 21,109.08-29,143.80-13,558.46

Finding the Fourth Proportional to 21,109.08, 29,143.80 and 13,558.46

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Solution

The fourth proportional to 21,109.08, 29,143.80 and 13,558.46 is: 18,719.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.08 : 29,143.80 = 13,558.46 : x
  2. Step 2: Convert to fraction form
    21,109.08/29,143.80 = 13,558.46/x
  3. Step 3: Cross multiply
    21,109.08x = 29,143.80 × 13,558.46
  4. Step 4: Simplify right side
    21,109.08x = 395,145,046.55
  5. Step 5: Solve for x
    x = 395,145,046.55/21,109.08
  6. Step 6: Final answer
    x = 18,719.20

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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.