Home / 21,165.09-31,747.42-12,847.40

Finding the Fourth Proportional to 21,165.09, 31,747.42 and 12,847.40

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Solution

The fourth proportional to 21,165.09, 31,747.42 and 12,847.40 is: 19,270.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,165.09 : 31,747.42 = 12,847.40 : x
  2. Step 2: Convert to fraction form
    21,165.09/31,747.42 = 12,847.40/x
  3. Step 3: Cross multiply
    21,165.09x = 31,747.42 × 12,847.40
  4. Step 4: Simplify right side
    21,165.09x = 407,871,803.71
  5. Step 5: Solve for x
    x = 407,871,803.71/21,165.09
  6. Step 6: Final answer
    x = 19,270.97

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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.