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Finding the Fourth Proportional to 128,053.40, 192,080.10 and 115,368.80

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Solution

The fourth proportional to 128,053.40, 192,080.10 and 115,368.80 is: 173,053.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,053.40 : 192,080.10 = 115,368.80 : x
  2. Step 2: Convert to fraction form
    128,053.40/192,080.10 = 115,368.80/x
  3. Step 3: Cross multiply
    128,053.40x = 192,080.10 × 115,368.80
  4. Step 4: Simplify right side
    128,053.40x = 22,160,050,640.88
  5. Step 5: Solve for x
    x = 22,160,050,640.88/128,053.40
  6. Step 6: Final answer
    x = 173,053.20

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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.