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Finding the Fourth Proportional to 18,905.32, 28,356.54 and 7,809

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Solution

The fourth proportional to 18,905.32, 28,356.54 and 7,809 is: 11,712.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,905.32 : 28,356.54 = 7,809 : x
  2. Step 2: Convert to fraction form
    18,905.32/28,356.54 = 7,809/x
  3. Step 3: Cross multiply
    18,905.32x = 28,356.54 × 7,809
  4. Step 4: Simplify right side
    18,905.32x = 221,436,220.86
  5. Step 5: Solve for x
    x = 221,436,220.86/18,905.32
  6. Step 6: Final answer
    x = 11,712.91

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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.