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Finding the Fourth Proportional to 18,969.84, 28,461.12 and 11,941.68

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Solution

The fourth proportional to 18,969.84, 28,461.12 and 11,941.68 is: 17,916.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.84 : 28,461.12 = 11,941.68 : x
  2. Step 2: Convert to fraction form
    18,969.84/28,461.12 = 11,941.68/x
  3. Step 3: Cross multiply
    18,969.84x = 28,461.12 × 11,941.68
  4. Step 4: Simplify right side
    18,969.84x = 339,873,587.48
  5. Step 5: Solve for x
    x = 339,873,587.48/18,969.84
  6. Step 6: Final answer
    x = 17,916.52

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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.