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Finding the Fourth Proportional to 21,765.25, 30,038.88 and 12,813.58

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Solution

The fourth proportional to 21,765.25, 30,038.88 and 12,813.58 is: 17,684.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,765.25 : 30,038.88 = 12,813.58 : x
  2. Step 2: Convert to fraction form
    21,765.25/30,038.88 = 12,813.58/x
  3. Step 3: Cross multiply
    21,765.25x = 30,038.88 × 12,813.58
  4. Step 4: Simplify right side
    21,765.25x = 384,905,591.99
  5. Step 5: Solve for x
    x = 384,905,591.99/21,765.25
  6. Step 6: Final answer
    x = 17,684.41

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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.