Home / 20,920.84-28,884.28-12,971.50

Finding the Fourth Proportional to 20,920.84, 28,884.28 and 12,971.50

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Solution

The fourth proportional to 20,920.84, 28,884.28 and 12,971.50 is: 17,909.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.84 : 28,884.28 = 12,971.50 : x
  2. Step 2: Convert to fraction form
    20,920.84/28,884.28 = 12,971.50/x
  3. Step 3: Cross multiply
    20,920.84x = 28,884.28 × 12,971.50
  4. Step 4: Simplify right side
    20,920.84x = 374,672,438.02
  5. Step 5: Solve for x
    x = 374,672,438.02/20,920.84
  6. Step 6: Final answer
    x = 17,909.05

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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.