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Finding the Fourth Proportional to 76,987.92, 105,471.69 and 74,109.58

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Solution

The fourth proportional to 76,987.92, 105,471.69 and 74,109.58 is: 101,528.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,987.92 : 105,471.69 = 74,109.58 : x
  2. Step 2: Convert to fraction form
    76,987.92/105,471.69 = 74,109.58/x
  3. Step 3: Cross multiply
    76,987.92x = 105,471.69 × 74,109.58
  4. Step 4: Simplify right side
    76,987.92x = 7,816,462,699.48
  5. Step 5: Solve for x
    x = 7,816,462,699.48/76,987.92
  6. Step 6: Final answer
    x = 101,528.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.