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Finding the Fourth Proportional to 170,783.10, 256,247.55 and 81,990.90

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Solution

The fourth proportional to 170,783.10, 256,247.55 and 81,990.90 is: 123,021.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,783.10 : 256,247.55 = 81,990.90 : x
  2. Step 2: Convert to fraction form
    170,783.10/256,247.55 = 81,990.90/x
  3. Step 3: Cross multiply
    170,783.10x = 256,247.55 × 81,990.90
  4. Step 4: Simplify right side
    170,783.10x = 21,009,967,247.30
  5. Step 5: Solve for x
    x = 21,009,967,247.30/170,783.10
  6. Step 6: Final answer
    x = 123,021.35

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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.