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Finding the Fourth Proportional to 81,665.69, 112,615.76 and 76,903.43

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Solution

The fourth proportional to 81,665.69, 112,615.76 and 76,903.43 is: 106,048.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,665.69 : 112,615.76 = 76,903.43 : x
  2. Step 2: Convert to fraction form
    81,665.69/112,615.76 = 76,903.43/x
  3. Step 3: Cross multiply
    81,665.69x = 112,615.76 × 76,903.43
  4. Step 4: Simplify right side
    81,665.69x = 8,660,537,845.24
  5. Step 5: Solve for x
    x = 8,660,537,845.24/81,665.69
  6. Step 6: Final answer
    x = 106,048.68

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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.