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Finding the Fourth Proportional to 128,674.61, 177,528.44 and 77,667.96

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Solution

The fourth proportional to 128,674.61, 177,528.44 and 77,667.96 is: 107,156.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,674.61 : 177,528.44 = 77,667.96 : x
  2. Step 2: Convert to fraction form
    128,674.61/177,528.44 = 77,667.96/x
  3. Step 3: Cross multiply
    128,674.61x = 177,528.44 × 77,667.96
  4. Step 4: Simplify right side
    128,674.61x = 13,788,272,636.68
  5. Step 5: Solve for x
    x = 13,788,272,636.68/128,674.61
  6. Step 6: Final answer
    x = 107,156.13

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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.