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Finding the Fourth Proportional to 45,432.60, 68,140.80 and 28,762.80

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Solution

The fourth proportional to 45,432.60, 68,140.80 and 28,762.80 is: 43,139.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    45,432.60 : 68,140.80 = 28,762.80 : x
  2. Step 2: Convert to fraction form
    45,432.60/68,140.80 = 28,762.80/x
  3. Step 3: Cross multiply
    45,432.60x = 68,140.80 × 28,762.80
  4. Step 4: Simplify right side
    45,432.60x = 1,959,920,202.24
  5. Step 5: Solve for x
    x = 1,959,920,202.24/45,432.60
  6. Step 6: Final answer
    x = 43,139.07

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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.