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Finding the Fourth Proportional to 128,607.90, 177,474.78 and 71,244.87

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Solution

The fourth proportional to 128,607.90, 177,474.78 and 71,244.87 is: 98,315.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,607.90 : 177,474.78 = 71,244.87 : x
  2. Step 2: Convert to fraction form
    128,607.90/177,474.78 = 71,244.87/x
  3. Step 3: Cross multiply
    128,607.90x = 177,474.78 × 71,244.87
  4. Step 4: Simplify right side
    128,607.90x = 12,644,167,629.38
  5. Step 5: Solve for x
    x = 12,644,167,629.38/128,607.90
  6. Step 6: Final answer
    x = 98,315.64

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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.