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Finding the Fourth Proportional to 76,393.15, 105,420.96 and 42,399.64

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Solution

The fourth proportional to 76,393.15, 105,420.96 and 42,399.64 is: 58,510.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,393.15 : 105,420.96 = 42,399.64 : x
  2. Step 2: Convert to fraction form
    76,393.15/105,420.96 = 42,399.64/x
  3. Step 3: Cross multiply
    76,393.15x = 105,420.96 × 42,399.64
  4. Step 4: Simplify right side
    76,393.15x = 4,469,810,540.46
  5. Step 5: Solve for x
    x = 4,469,810,540.46/76,393.15
  6. Step 6: Final answer
    x = 58,510.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.