Home / 20,390.64-28,137.80-11,438.08

Finding the Fourth Proportional to 20,390.64, 28,137.80 and 11,438.08

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Solution

The fourth proportional to 20,390.64, 28,137.80 and 11,438.08 is: 15,783.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.64 : 28,137.80 = 11,438.08 : x
  2. Step 2: Convert to fraction form
    20,390.64/28,137.80 = 11,438.08/x
  3. Step 3: Cross multiply
    20,390.64x = 28,137.80 × 11,438.08
  4. Step 4: Simplify right side
    20,390.64x = 321,842,407.42
  5. Step 5: Solve for x
    x = 321,842,407.42/20,390.64
  6. Step 6: Final answer
    x = 15,783.83

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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.