Home / 20,381.93-28,115.14-12,816.28

Finding the Fourth Proportional to 20,381.93, 28,115.14 and 12,816.28

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Solution

The fourth proportional to 20,381.93, 28,115.14 and 12,816.28 is: 17,678.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,381.93 : 28,115.14 = 12,816.28 : x
  2. Step 2: Convert to fraction form
    20,381.93/28,115.14 = 12,816.28/x
  3. Step 3: Cross multiply
    20,381.93x = 28,115.14 × 12,816.28
  4. Step 4: Simplify right side
    20,381.93x = 360,331,301.82
  5. Step 5: Solve for x
    x = 360,331,301.82/20,381.93
  6. Step 6: Final answer
    x = 17,678.96

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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.