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Finding the Fourth Proportional to 15,772.95, 21,768.21 and 11,787.12

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Solution

The fourth proportional to 15,772.95, 21,768.21 and 11,787.12 is: 16,267.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,772.95 : 21,768.21 = 11,787.12 : x
  2. Step 2: Convert to fraction form
    15,772.95/21,768.21 = 11,787.12/x
  3. Step 3: Cross multiply
    15,772.95x = 21,768.21 × 11,787.12
  4. Step 4: Simplify right side
    15,772.95x = 256,584,503.46
  5. Step 5: Solve for x
    x = 256,584,503.46/15,772.95
  6. Step 6: Final answer
    x = 16,267.38

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Double scale
Find fourth proportional to 15,773.95, 21,769.59 and 11,788.12
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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.