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Finding the Fourth Proportional to 28,616.25, 42,909.80 and 11,971.77

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Solution

The fourth proportional to 28,616.25, 42,909.80 and 11,971.77 is: 17,951.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,616.25 : 42,909.80 = 11,971.77 : x
  2. Step 2: Convert to fraction form
    28,616.25/42,909.80 = 11,971.77/x
  3. Step 3: Cross multiply
    28,616.25x = 42,909.80 × 11,971.77
  4. Step 4: Simplify right side
    28,616.25x = 513,706,196.49
  5. Step 5: Solve for x
    x = 513,706,196.49/28,616.25
  6. Step 6: Final answer
    x = 17,951.56

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.