Home / 20,390.18-28,138.27-11,437.49

Finding the Fourth Proportional to 20,390.18, 28,138.27 and 11,437.49

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Solution

The fourth proportional to 20,390.18, 28,138.27 and 11,437.49 is: 15,783.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,390.18 : 28,138.27 = 11,437.49 : x
  2. Step 2: Convert to fraction form
    20,390.18/28,138.27 = 11,437.49/x
  3. Step 3: Cross multiply
    20,390.18x = 28,138.27 × 11,437.49
  4. Step 4: Simplify right side
    20,390.18x = 321,830,983.86
  5. Step 5: Solve for x
    x = 321,830,983.86/20,390.18
  6. Step 6: Final answer
    x = 15,783.63

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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.