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Finding the Fourth Proportional to 128,121.39, 176,814.23 and 71,529.39

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Solution

The fourth proportional to 128,121.39, 176,814.23 and 71,529.39 is: 98,714.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,121.39 : 176,814.23 = 71,529.39 : x
  2. Step 2: Convert to fraction form
    128,121.39/176,814.23 = 71,529.39/x
  3. Step 3: Cross multiply
    128,121.39x = 176,814.23 × 71,529.39
  4. Step 4: Simplify right side
    128,121.39x = 12,647,413,657.57
  5. Step 5: Solve for x
    x = 12,647,413,657.57/128,121.39
  6. Step 6: Final answer
    x = 98,714.30

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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.