Home / 21,988.11-30,344.18-12,556.47

Finding the Fourth Proportional to 21,988.11, 30,344.18 and 12,556.47

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Solution

The fourth proportional to 21,988.11, 30,344.18 and 12,556.47 is: 17,328.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,988.11 : 30,344.18 = 12,556.47 : x
  2. Step 2: Convert to fraction form
    21,988.11/30,344.18 = 12,556.47/x
  3. Step 3: Cross multiply
    21,988.11x = 30,344.18 × 12,556.47
  4. Step 4: Simplify right side
    21,988.11x = 381,015,723.06
  5. Step 5: Solve for x
    x = 381,015,723.06/21,988.11
  6. Step 6: Final answer
    x = 17,328.26

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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.