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Finding the Fourth Proportional to 22,329.90, 30,815.40 and 12,258.78

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Solution

The fourth proportional to 22,329.90, 30,815.40 and 12,258.78 is: 16,917.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    22,329.90 : 30,815.40 = 12,258.78 : x
  2. Step 2: Convert to fraction form
    22,329.90/30,815.40 = 12,258.78/x
  3. Step 3: Cross multiply
    22,329.90x = 30,815.40 × 12,258.78
  4. Step 4: Simplify right side
    22,329.90x = 377,759,209.21
  5. Step 5: Solve for x
    x = 377,759,209.21/22,329.90
  6. Step 6: Final answer
    x = 16,917.19

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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.