Home / 20,817.29-31,238.15-7,678.82

Finding the Fourth Proportional to 20,817.29, 31,238.15 and 7,678.82

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Solution

The fourth proportional to 20,817.29, 31,238.15 and 7,678.82 is: 11,522.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,817.29 : 31,238.15 = 7,678.82 : x
  2. Step 2: Convert to fraction form
    20,817.29/31,238.15 = 7,678.82/x
  3. Step 3: Cross multiply
    20,817.29x = 31,238.15 × 7,678.82
  4. Step 4: Simplify right side
    20,817.29x = 239,871,936.40
  5. Step 5: Solve for x
    x = 239,871,936.40/20,817.29
  6. Step 6: Final answer
    x = 11,522.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.