Home / 20,138.43-27,798.78-13,421.60

Finding the Fourth Proportional to 20,138.43, 27,798.78 and 13,421.60

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Solution

The fourth proportional to 20,138.43, 27,798.78 and 13,421.60 is: 18,526.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,138.43 : 27,798.78 = 13,421.60 : x
  2. Step 2: Convert to fraction form
    20,138.43/27,798.78 = 13,421.60/x
  3. Step 3: Cross multiply
    20,138.43x = 27,798.78 × 13,421.60
  4. Step 4: Simplify right side
    20,138.43x = 373,104,126.61
  5. Step 5: Solve for x
    x = 373,104,126.61/20,138.43
  6. Step 6: Final answer
    x = 18,526.98

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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.