Home / 20,378.78-28,125.87-11,429.90

Finding the Fourth Proportional to 20,378.78, 28,125.87 and 11,429.90

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Solution

The fourth proportional to 20,378.78, 28,125.87 and 11,429.90 is: 15,775.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.78 : 28,125.87 = 11,429.90 : x
  2. Step 2: Convert to fraction form
    20,378.78/28,125.87 = 11,429.90/x
  3. Step 3: Cross multiply
    20,378.78x = 28,125.87 × 11,429.90
  4. Step 4: Simplify right side
    20,378.78x = 321,475,881.51
  5. Step 5: Solve for x
    x = 321,475,881.51/20,378.78
  6. Step 6: Final answer
    x = 15,775.03

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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.