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Finding the Fourth Proportional to 76,643.80, 105,771.90 and 43,109.80

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Solution

The fourth proportional to 76,643.80, 105,771.90 and 43,109.80 is: 59,493.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,643.80 : 105,771.90 = 43,109.80 : x
  2. Step 2: Convert to fraction form
    76,643.80/105,771.90 = 43,109.80/x
  3. Step 3: Cross multiply
    76,643.80x = 105,771.90 × 43,109.80
  4. Step 4: Simplify right side
    76,643.80x = 4,559,805,454.62
  5. Step 5: Solve for x
    x = 4,559,805,454.62/76,643.80
  6. Step 6: Final answer
    x = 59,493.47

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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.