Home / 20,918.84-28,881.52-12,969.50

Finding the Fourth Proportional to 20,918.84, 28,881.52 and 12,969.50

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Solution

The fourth proportional to 20,918.84, 28,881.52 and 12,969.50 is: 17,906.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.84 : 28,881.52 = 12,969.50 : x
  2. Step 2: Convert to fraction form
    20,918.84/28,881.52 = 12,969.50/x
  3. Step 3: Cross multiply
    20,918.84x = 28,881.52 × 12,969.50
  4. Step 4: Simplify right side
    20,918.84x = 374,578,873.64
  5. Step 5: Solve for x
    x = 374,578,873.64/20,918.84
  6. Step 6: Final answer
    x = 17,906.29

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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.