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Finding the Fourth Proportional to 128,379.16, 177,168.06 and 71,790.40

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Solution

The fourth proportional to 128,379.16, 177,168.06 and 71,790.40 is: 99,073.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,379.16 : 177,168.06 = 71,790.40 : x
  2. Step 2: Convert to fraction form
    128,379.16/177,168.06 = 71,790.40/x
  3. Step 3: Cross multiply
    128,379.16x = 177,168.06 × 71,790.40
  4. Step 4: Simplify right side
    128,379.16x = 12,718,965,894.62
  5. Step 5: Solve for x
    x = 12,718,965,894.62/128,379.16
  6. Step 6: Final answer
    x = 99,073.45

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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.