Home / 20,405.34-28,159.48-11,913.36

Finding the Fourth Proportional to 20,405.34, 28,159.48 and 11,913.36

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Solution

The fourth proportional to 20,405.34, 28,159.48 and 11,913.36 is: 16,440.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405.34 : 28,159.48 = 11,913.36 : x
  2. Step 2: Convert to fraction form
    20,405.34/28,159.48 = 11,913.36/x
  3. Step 3: Cross multiply
    20,405.34x = 28,159.48 × 11,913.36
  4. Step 4: Simplify right side
    20,405.34x = 335,473,887.27
  5. Step 5: Solve for x
    x = 335,473,887.27/20,405.34
  6. Step 6: Final answer
    x = 16,440.49

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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.