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Finding the Fourth Proportional to 18,887.30, 28,334.39 and 7,787.82

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Solution

The fourth proportional to 18,887.30, 28,334.39 and 7,787.82 is: 11,683.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,887.30 : 28,334.39 = 7,787.82 : x
  2. Step 2: Convert to fraction form
    18,887.30/28,334.39 = 7,787.82/x
  3. Step 3: Cross multiply
    18,887.30x = 28,334.39 × 7,787.82
  4. Step 4: Simplify right side
    18,887.30x = 220,663,090.19
  5. Step 5: Solve for x
    x = 220,663,090.19/18,887.30
  6. Step 6: Final answer
    x = 11,683.15

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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.