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Finding the Fourth Proportional to 128,367.84, 177,147.63 and 71,779.35

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Solution

The fourth proportional to 128,367.84, 177,147.63 and 71,779.35 is: 99,055.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,367.84 : 177,147.63 = 71,779.35 : x
  2. Step 2: Convert to fraction form
    128,367.84/177,147.63 = 71,779.35/x
  3. Step 3: Cross multiply
    128,367.84x = 177,147.63 × 71,779.35
  4. Step 4: Simplify right side
    128,367.84x = 12,715,541,735.44
  5. Step 5: Solve for x
    x = 12,715,541,735.44/128,367.84
  6. Step 6: Final answer
    x = 99,055.51

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1.5x scale

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.