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Finding the Fourth Proportional to 128,672.99, 177,635.93 and 99,928.16

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Solution

The fourth proportional to 128,672.99, 177,635.93 and 99,928.16 is: 137,953.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,672.99 : 177,635.93 = 99,928.16 : x
  2. Step 2: Convert to fraction form
    128,672.99/177,635.93 = 99,928.16/x
  3. Step 3: Cross multiply
    128,672.99x = 177,635.93 × 99,928.16
  4. Step 4: Simplify right side
    128,672.99x = 17,750,830,246.97
  5. Step 5: Solve for x
    x = 17,750,830,246.97/128,672.99
  6. Step 6: Final answer
    x = 137,953.05

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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.