Home / 20,991.42-28,966.95-12,606.30

Finding the Fourth Proportional to 20,991.42, 28,966.95 and 12,606.30

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Solution

The fourth proportional to 20,991.42, 28,966.95 and 12,606.30 is: 17,395.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,991.42 : 28,966.95 = 12,606.30 : x
  2. Step 2: Convert to fraction form
    20,991.42/28,966.95 = 12,606.30/x
  3. Step 3: Cross multiply
    20,991.42x = 28,966.95 × 12,606.30
  4. Step 4: Simplify right side
    20,991.42x = 365,166,061.79
  5. Step 5: Solve for x
    x = 365,166,061.79/20,991.42
  6. Step 6: Final answer
    x = 17,395.97

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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.