Home / 13,979.90-20,811.34-13,905.98

Finding the Fourth Proportional to 13,979.90, 20,811.34 and 13,905.98

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Solution

The fourth proportional to 13,979.90, 20,811.34 and 13,905.98 is: 20,701.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,979.90 : 20,811.34 = 13,905.98 : x
  2. Step 2: Convert to fraction form
    13,979.90/20,811.34 = 13,905.98/x
  3. Step 3: Cross multiply
    13,979.90x = 20,811.34 × 13,905.98
  4. Step 4: Simplify right side
    13,979.90x = 289,402,077.81
  5. Step 5: Solve for x
    x = 289,402,077.81/13,979.90
  6. Step 6: Final answer
    x = 20,701.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.