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Finding the Fourth Proportional to 128,429.40, 192,644.10 and 115,339.80

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Solution

The fourth proportional to 128,429.40, 192,644.10 and 115,339.80 is: 173,009.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,429.40 : 192,644.10 = 115,339.80 : x
  2. Step 2: Convert to fraction form
    128,429.40/192,644.10 = 115,339.80/x
  3. Step 3: Cross multiply
    128,429.40x = 192,644.10 × 115,339.80
  4. Step 4: Simplify right side
    128,429.40x = 22,219,531,965.18
  5. Step 5: Solve for x
    x = 22,219,531,965.18/128,429.40
  6. Step 6: Final answer
    x = 173,009.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.