Home / 20,400.55-28,145.54-13,331.07

Finding the Fourth Proportional to 20,400.55, 28,145.54 and 13,331.07

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Solution

The fourth proportional to 20,400.55, 28,145.54 and 13,331.07 is: 18,392.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,400.55 : 28,145.54 = 13,331.07 : x
  2. Step 2: Convert to fraction form
    20,400.55/28,145.54 = 13,331.07/x
  3. Step 3: Cross multiply
    20,400.55x = 28,145.54 × 13,331.07
  4. Step 4: Simplify right side
    20,400.55x = 375,210,238.92
  5. Step 5: Solve for x
    x = 375,210,238.92/20,400.55
  6. Step 6: Final answer
    x = 18,392.16

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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.