Home / 20,909.12-28,860.12-12,946.82

Finding the Fourth Proportional to 20,909.12, 28,860.12 and 12,946.82

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Solution

The fourth proportional to 20,909.12, 28,860.12 and 12,946.82 is: 17,870.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.12 : 28,860.12 = 12,946.82 : x
  2. Step 2: Convert to fraction form
    20,909.12/28,860.12 = 12,946.82/x
  3. Step 3: Cross multiply
    20,909.12x = 28,860.12 × 12,946.82
  4. Step 4: Simplify right side
    20,909.12x = 373,646,850.97
  5. Step 5: Solve for x
    x = 373,646,850.97/20,909.12
  6. Step 6: Final answer
    x = 17,870.04

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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.