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Finding the Fourth Proportional to 128,392.65, 177,173.82 and 71,030.61

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Solution

The fourth proportional to 128,392.65, 177,173.82 and 71,030.61 is: 98,017.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,392.65 : 177,173.82 = 71,030.61 : x
  2. Step 2: Convert to fraction form
    128,392.65/177,173.82 = 71,030.61/x
  3. Step 3: Cross multiply
    128,392.65x = 177,173.82 × 71,030.61
  4. Step 4: Simplify right side
    128,392.65x = 12,584,764,510.63
  5. Step 5: Solve for x
    x = 12,584,764,510.63/128,392.65
  6. Step 6: Final answer
    x = 98,017.80

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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.