Home / 20,385.90-28,133.75-11,433.90

Finding the Fourth Proportional to 20,385.90, 28,133.75 and 11,433.90

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Solution

The fourth proportional to 20,385.90, 28,133.75 and 11,433.90 is: 15,779.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,385.90 : 28,133.75 = 11,433.90 : x
  2. Step 2: Convert to fraction form
    20,385.90/28,133.75 = 11,433.90/x
  3. Step 3: Cross multiply
    20,385.90x = 28,133.75 × 11,433.90
  4. Step 4: Simplify right side
    20,385.90x = 321,678,618.21
  5. Step 5: Solve for x
    x = 321,678,618.21/20,385.90
  6. Step 6: Final answer
    x = 15,779.47

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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.