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Finding the Fourth Proportional to 76,390.93, 105,410.94 and 42,400.85

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Solution

The fourth proportional to 76,390.93, 105,410.94 and 42,400.85 is: 58,508.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,390.93 : 105,410.94 = 42,400.85 : x
  2. Step 2: Convert to fraction form
    76,390.93/105,410.94 = 42,400.85/x
  3. Step 3: Cross multiply
    76,390.93x = 105,410.94 × 42,400.85
  4. Step 4: Simplify right side
    76,390.93x = 4,469,513,455.30
  5. Step 5: Solve for x
    x = 4,469,513,455.30/76,390.93
  6. Step 6: Final answer
    x = 58,508.43

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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.