Home / 21,215.50-29,280.64-12,836.86

Finding the Fourth Proportional to 21,215.50, 29,280.64 and 12,836.86

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Solution

The fourth proportional to 21,215.50, 29,280.64 and 12,836.86 is: 17,716.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.50 : 29,280.64 = 12,836.86 : x
  2. Step 2: Convert to fraction form
    21,215.50/29,280.64 = 12,836.86/x
  3. Step 3: Cross multiply
    21,215.50x = 29,280.64 × 12,836.86
  4. Step 4: Simplify right side
    21,215.50x = 375,871,476.39
  5. Step 5: Solve for x
    x = 375,871,476.39/21,215.50
  6. Step 6: Final answer
    x = 17,716.83

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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.