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Finding the Fourth Proportional to 20,981, 28,953.78 and 11,550.26

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Solution

The fourth proportional to 20,981, 28,953.78 and 11,550.26 is: 15,939.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981 : 28,953.78 = 11,550.26 : x
  2. Step 2: Convert to fraction form
    20,981/28,953.78 = 11,550.26/x
  3. Step 3: Cross multiply
    20,981x = 28,953.78 × 11,550.26
  4. Step 4: Simplify right side
    20,981x = 334,423,686.98
  5. Step 5: Solve for x
    x = 334,423,686.98/20,981
  6. Step 6: Final answer
    x = 15,939.36

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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.