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Finding the Fourth Proportional to 76,489.68, 105,181.43 and 66,400.49

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Solution

The fourth proportional to 76,489.68, 105,181.43 and 66,400.49 is: 91,307.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,489.68 : 105,181.43 = 66,400.49 : x
  2. Step 2: Convert to fraction form
    76,489.68/105,181.43 = 66,400.49/x
  3. Step 3: Cross multiply
    76,489.68x = 105,181.43 × 66,400.49
  4. Step 4: Simplify right side
    76,489.68x = 6,984,097,632.99
  5. Step 5: Solve for x
    x = 6,984,097,632.99/76,489.68
  6. Step 6: Final answer
    x = 91,307.71

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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.