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Finding the Fourth Proportional to 128,354.61, 192,557.59 and 39,604.78

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Solution

The fourth proportional to 128,354.61, 192,557.59 and 39,604.78 is: 59,415.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,354.61 : 192,557.59 = 39,604.78 : x
  2. Step 2: Convert to fraction form
    128,354.61/192,557.59 = 39,604.78/x
  3. Step 3: Cross multiply
    128,354.61x = 192,557.59 × 39,604.78
  4. Step 4: Simplify right side
    128,354.61x = 7,626,201,130.97
  5. Step 5: Solve for x
    x = 7,626,201,130.97/128,354.61
  6. Step 6: Final answer
    x = 59,415.09

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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.