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Finding the Fourth Proportional to 18,969.60, 28,463.99 and 9,117.17

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Solution

The fourth proportional to 18,969.60, 28,463.99 and 9,117.17 is: 13,680.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,969.60 : 28,463.99 = 9,117.17 : x
  2. Step 2: Convert to fraction form
    18,969.60/28,463.99 = 9,117.17/x
  3. Step 3: Cross multiply
    18,969.60x = 28,463.99 × 9,117.17
  4. Step 4: Simplify right side
    18,969.60x = 259,510,847.80
  5. Step 5: Solve for x
    x = 259,510,847.80/18,969.60
  6. Step 6: Final answer
    x = 13,680.35

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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.