Home / 20,387.91-28,135.59-12,320.43

Finding the Fourth Proportional to 20,387.91, 28,135.59 and 12,320.43

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Solution

The fourth proportional to 20,387.91, 28,135.59 and 12,320.43 is: 17,002.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.91 : 28,135.59 = 12,320.43 : x
  2. Step 2: Convert to fraction form
    20,387.91/28,135.59 = 12,320.43/x
  3. Step 3: Cross multiply
    20,387.91x = 28,135.59 × 12,320.43
  4. Step 4: Simplify right side
    20,387.91x = 346,642,567.10
  5. Step 5: Solve for x
    x = 346,642,567.10/20,387.91
  6. Step 6: Final answer
    x = 17,002.36

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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.