Home / 21,556.40-32,406.60-18,705.20

Finding the Fourth Proportional to 21,556.40, 32,406.60 and 18,705.20

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Solution

The fourth proportional to 21,556.40, 32,406.60 and 18,705.20 is: 28,120.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,556.40 : 32,406.60 = 18,705.20 : x
  2. Step 2: Convert to fraction form
    21,556.40/32,406.60 = 18,705.20/x
  3. Step 3: Cross multiply
    21,556.40x = 32,406.60 × 18,705.20
  4. Step 4: Simplify right side
    21,556.40x = 606,171,934.32
  5. Step 5: Solve for x
    x = 606,171,934.32/21,556.40
  6. Step 6: Final answer
    x = 28,120.28

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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.