Home / 20,874.35-28,807.79-12,381.50

Finding the Fourth Proportional to 20,874.35, 28,807.79 and 12,381.50

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Solution

The fourth proportional to 20,874.35, 28,807.79 and 12,381.50 is: 17,087.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,874.35 : 28,807.79 = 12,381.50 : x
  2. Step 2: Convert to fraction form
    20,874.35/28,807.79 = 12,381.50/x
  3. Step 3: Cross multiply
    20,874.35x = 28,807.79 × 12,381.50
  4. Step 4: Simplify right side
    20,874.35x = 356,683,662.00
  5. Step 5: Solve for x
    x = 356,683,662.00/20,874.35
  6. Step 6: Final answer
    x = 17,087.17

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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.