Home / 20,936.86-31,405.29-9,835.40

Finding the Fourth Proportional to 20,936.86, 31,405.29 and 9,835.40

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Solution

The fourth proportional to 20,936.86, 31,405.29 and 9,835.40 is: 14,753.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,936.86 : 31,405.29 = 9,835.40 : x
  2. Step 2: Convert to fraction form
    20,936.86/31,405.29 = 9,835.40/x
  3. Step 3: Cross multiply
    20,936.86x = 31,405.29 × 9,835.40
  4. Step 4: Simplify right side
    20,936.86x = 308,883,667.78
  5. Step 5: Solve for x
    x = 308,883,667.78/20,936.86
  6. Step 6: Final answer
    x = 14,753.11

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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.