Home / 21,171.12-29,154.48-19,818.80

Finding the Fourth Proportional to 21,171.12, 29,154.48 and 19,818.80

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Solution

The fourth proportional to 21,171.12, 29,154.48 and 19,818.80 is: 27,292.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,171.12 : 29,154.48 = 19,818.80 : x
  2. Step 2: Convert to fraction form
    21,171.12/29,154.48 = 19,818.80/x
  3. Step 3: Cross multiply
    21,171.12x = 29,154.48 × 19,818.80
  4. Step 4: Simplify right side
    21,171.12x = 577,806,808.22
  5. Step 5: Solve for x
    x = 577,806,808.22/21,171.12
  6. Step 6: Final answer
    x = 27,292.22

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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.