Home / 21,390.20-32,042.10-12,145.40

Finding the Fourth Proportional to 21,390.20, 32,042.10 and 12,145.40

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Solution

The fourth proportional to 21,390.20, 32,042.10 and 12,145.40 is: 18,193.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,390.20 : 32,042.10 = 12,145.40 : x
  2. Step 2: Convert to fraction form
    21,390.20/32,042.10 = 12,145.40/x
  3. Step 3: Cross multiply
    21,390.20x = 32,042.10 × 12,145.40
  4. Step 4: Simplify right side
    21,390.20x = 389,164,121.34
  5. Step 5: Solve for x
    x = 389,164,121.34/21,390.20
  6. Step 6: Final answer
    x = 18,193.57

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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.