Home / 20,387.68-28,134.88-12,429.44

Finding the Fourth Proportional to 20,387.68, 28,134.88 and 12,429.44

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Solution

The fourth proportional to 20,387.68, 28,134.88 and 12,429.44 is: 17,152.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.68 : 28,134.88 = 12,429.44 : x
  2. Step 2: Convert to fraction form
    20,387.68/28,134.88 = 12,429.44/x
  3. Step 3: Cross multiply
    20,387.68x = 28,134.88 × 12,429.44
  4. Step 4: Simplify right side
    20,387.68x = 349,700,802.87
  5. Step 5: Solve for x
    x = 349,700,802.87/20,387.68
  6. Step 6: Final answer
    x = 17,152.56

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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.