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Finding the Fourth Proportional to 86,472.42, 128,849.03 and 77,039.97

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Solution

The fourth proportional to 86,472.42, 128,849.03 and 77,039.97 is: 114,794.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,472.42 : 128,849.03 = 77,039.97 : x
  2. Step 2: Convert to fraction form
    86,472.42/128,849.03 = 77,039.97/x
  3. Step 3: Cross multiply
    86,472.42x = 128,849.03 × 77,039.97
  4. Step 4: Simplify right side
    86,472.42x = 9,926,525,598.33
  5. Step 5: Solve for x
    x = 9,926,525,598.33/86,472.42
  6. Step 6: Final answer
    x = 114,794.12

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.