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Finding the Fourth Proportional to 76,620.81, 105,741.48 and 42,636.88

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Solution

The fourth proportional to 76,620.81, 105,741.48 and 42,636.88 is: 58,841.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,620.81 : 105,741.48 = 42,636.88 : x
  2. Step 2: Convert to fraction form
    76,620.81/105,741.48 = 42,636.88/x
  3. Step 3: Cross multiply
    76,620.81x = 105,741.48 × 42,636.88
  4. Step 4: Simplify right side
    76,620.81x = 4,508,486,793.78
  5. Step 5: Solve for x
    x = 4,508,486,793.78/76,620.81
  6. Step 6: Final answer
    x = 58,841.54

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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.