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Finding the Fourth Proportional to 128,956.34, 177,977.13 and 72,370.82

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Solution

The fourth proportional to 128,956.34, 177,977.13 and 72,370.82 is: 99,881.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,956.34 : 177,977.13 = 72,370.82 : x
  2. Step 2: Convert to fraction form
    128,956.34/177,977.13 = 72,370.82/x
  3. Step 3: Cross multiply
    128,956.34x = 177,977.13 × 72,370.82
  4. Step 4: Simplify right side
    128,956.34x = 12,880,350,839.35
  5. Step 5: Solve for x
    x = 12,880,350,839.35/128,956.34
  6. Step 6: Final answer
    x = 99,881.49

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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.