Home / 21,418.80-32,128.20-13,124.40

Finding the Fourth Proportional to 21,418.80, 32,128.20 and 13,124.40

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Solution

The fourth proportional to 21,418.80, 32,128.20 and 13,124.40 is: 19,686.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,418.80 : 32,128.20 = 13,124.40 : x
  2. Step 2: Convert to fraction form
    21,418.80/32,128.20 = 13,124.40/x
  3. Step 3: Cross multiply
    21,418.80x = 32,128.20 × 13,124.40
  4. Step 4: Simplify right side
    21,418.80x = 421,663,348.08
  5. Step 5: Solve for x
    x = 421,663,348.08/21,418.80
  6. Step 6: Final answer
    x = 19,686.60

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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.