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Finding the Fourth Proportional to 128,681.84, 177,580.68 and 72,092

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Solution

The fourth proportional to 128,681.84, 177,580.68 and 72,092 is: 99,486.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,681.84 : 177,580.68 = 72,092 : x
  2. Step 2: Convert to fraction form
    128,681.84/177,580.68 = 72,092/x
  3. Step 3: Cross multiply
    128,681.84x = 177,580.68 × 72,092
  4. Step 4: Simplify right side
    128,681.84x = 12,802,146,382.56
  5. Step 5: Solve for x
    x = 12,802,146,382.56/128,681.84
  6. Step 6: Final answer
    x = 99,486.81

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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.