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Finding the Fourth Proportional to 128,739.98, 177,661.15 and 71,379.12

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Solution

The fourth proportional to 128,739.98, 177,661.15 and 71,379.12 is: 98,503.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,739.98 : 177,661.15 = 71,379.12 : x
  2. Step 2: Convert to fraction form
    128,739.98/177,661.15 = 71,379.12/x
  3. Step 3: Cross multiply
    128,739.98x = 177,661.15 × 71,379.12
  4. Step 4: Simplify right side
    128,739.98x = 12,681,297,032.97
  5. Step 5: Solve for x
    x = 12,681,297,032.97/128,739.98
  6. Step 6: Final answer
    x = 98,503.18

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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.