Home / 20,816.88-28,720.52-12,319.28

Finding the Fourth Proportional to 20,816.88, 28,720.52 and 12,319.28

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Solution

The fourth proportional to 20,816.88, 28,720.52 and 12,319.28 is: 16,996.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,816.88 : 28,720.52 = 12,319.28 : x
  2. Step 2: Convert to fraction form
    20,816.88/28,720.52 = 12,319.28/x
  3. Step 3: Cross multiply
    20,816.88x = 28,720.52 × 12,319.28
  4. Step 4: Simplify right side
    20,816.88x = 353,816,127.63
  5. Step 5: Solve for x
    x = 353,816,127.63/20,816.88
  6. Step 6: Final answer
    x = 16,996.60

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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.