Home / 21,031.20-31,546.80-20,885.40

Finding the Fourth Proportional to 21,031.20, 31,546.80 and 20,885.40

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Solution

The fourth proportional to 21,031.20, 31,546.80 and 20,885.40 is: 31,328.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,031.20 : 31,546.80 = 20,885.40 : x
  2. Step 2: Convert to fraction form
    21,031.20/31,546.80 = 20,885.40/x
  3. Step 3: Cross multiply
    21,031.20x = 31,546.80 × 20,885.40
  4. Step 4: Simplify right side
    21,031.20x = 658,867,536.72
  5. Step 5: Solve for x
    x = 658,867,536.72/21,031.20
  6. Step 6: Final answer
    x = 31,328.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.