Home / 20,389.73-28,138.59-11,890.50

Finding the Fourth Proportional to 20,389.73, 28,138.59 and 11,890.50

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Solution

The fourth proportional to 20,389.73, 28,138.59 and 11,890.50 is: 16,409.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,389.73 : 28,138.59 = 11,890.50 : x
  2. Step 2: Convert to fraction form
    20,389.73/28,138.59 = 11,890.50/x
  3. Step 3: Cross multiply
    20,389.73x = 28,138.59 × 11,890.50
  4. Step 4: Simplify right side
    20,389.73x = 334,581,904.40
  5. Step 5: Solve for x
    x = 334,581,904.40/20,389.73
  6. Step 6: Final answer
    x = 16,409.34

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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.