Home / 20,943.12-28,885.12-12,980.84

Finding the Fourth Proportional to 20,943.12, 28,885.12 and 12,980.84

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Solution

The fourth proportional to 20,943.12, 28,885.12 and 12,980.84 is: 17,903.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,943.12 : 28,885.12 = 12,980.84 : x
  2. Step 2: Convert to fraction form
    20,943.12/28,885.12 = 12,980.84/x
  3. Step 3: Cross multiply
    20,943.12x = 28,885.12 × 12,980.84
  4. Step 4: Simplify right side
    20,943.12x = 374,953,121.10
  5. Step 5: Solve for x
    x = 374,953,121.10/20,943.12
  6. Step 6: Final answer
    x = 17,903.40

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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.