Home / 20,387.48-28,128.08-11,887.68

Finding the Fourth Proportional to 20,387.48, 28,128.08 and 11,887.68

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Solution

The fourth proportional to 20,387.48, 28,128.08 and 11,887.68 is: 16,401.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,387.48 : 28,128.08 = 11,887.68 : x
  2. Step 2: Convert to fraction form
    20,387.48/28,128.08 = 11,887.68/x
  3. Step 3: Cross multiply
    20,387.48x = 28,128.08 × 11,887.68
  4. Step 4: Simplify right side
    20,387.48x = 334,377,614.05
  5. Step 5: Solve for x
    x = 334,377,614.05/20,387.48
  6. Step 6: Final answer
    x = 16,401.13

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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.