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Finding the Fourth Proportional to 45,783.90, 68,719.05 and 28,287.90

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Solution

The fourth proportional to 45,783.90, 68,719.05 and 28,287.90 is: 42,458.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,783.90 : 68,719.05 = 28,287.90 : x
  2. Step 2: Convert to fraction form
    45,783.90/68,719.05 = 28,287.90/x
  3. Step 3: Cross multiply
    45,783.90x = 68,719.05 × 28,287.90
  4. Step 4: Simplify right side
    45,783.90x = 1,943,917,614.50
  5. Step 5: Solve for x
    x = 1,943,917,614.50/45,783.90
  6. Step 6: Final answer
    x = 42,458.54

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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.