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Finding the Fourth Proportional to 85,978.20, 128,967.30 and 36,041.70

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Solution

The fourth proportional to 85,978.20, 128,967.30 and 36,041.70 is: 54,062.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,978.20 : 128,967.30 = 36,041.70 : x
  2. Step 2: Convert to fraction form
    85,978.20/128,967.30 = 36,041.70/x
  3. Step 3: Cross multiply
    85,978.20x = 128,967.30 × 36,041.70
  4. Step 4: Simplify right side
    85,978.20x = 4,648,200,736.41
  5. Step 5: Solve for x
    x = 4,648,200,736.41/85,978.20
  6. Step 6: Final answer
    x = 54,062.55

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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.