Home / 20,400.72-28,127.16-13,315.92

Finding the Fourth Proportional to 20,400.72, 28,127.16 and 13,315.92

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Solution

The fourth proportional to 20,400.72, 28,127.16 and 13,315.92 is: 18,359.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,400.72 : 28,127.16 = 13,315.92 : x
  2. Step 2: Convert to fraction form
    20,400.72/28,127.16 = 13,315.92/x
  3. Step 3: Cross multiply
    20,400.72x = 28,127.16 × 13,315.92
  4. Step 4: Simplify right side
    20,400.72x = 374,539,012.39
  5. Step 5: Solve for x
    x = 374,539,012.39/20,400.72
  6. Step 6: Final answer
    x = 18,359.11

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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.