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Finding the Fourth Proportional to 128,020.80, 192,068.30 and 39,287.40

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Solution

The fourth proportional to 128,020.80, 192,068.30 and 39,287.40 is: 58,942.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,020.80 : 192,068.30 = 39,287.40 : x
  2. Step 2: Convert to fraction form
    128,020.80/192,068.30 = 39,287.40/x
  3. Step 3: Cross multiply
    128,020.80x = 192,068.30 × 39,287.40
  4. Step 4: Simplify right side
    128,020.80x = 7,545,864,129.42
  5. Step 5: Solve for x
    x = 7,545,864,129.42/128,020.80
  6. Step 6: Final answer
    x = 58,942.49

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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.