Home / 20,487.29-28,274.85-12,420.84

Finding the Fourth Proportional to 20,487.29, 28,274.85 and 12,420.84

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Solution

The fourth proportional to 20,487.29, 28,274.85 and 12,420.84 is: 17,142.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487.29 : 28,274.85 = 12,420.84 : x
  2. Step 2: Convert to fraction form
    20,487.29/28,274.85 = 12,420.84/x
  3. Step 3: Cross multiply
    20,487.29x = 28,274.85 × 12,420.84
  4. Step 4: Simplify right side
    20,487.29x = 351,197,387.87
  5. Step 5: Solve for x
    x = 351,197,387.87/20,487.29
  6. Step 6: Final answer
    x = 17,142.21

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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.