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Finding the Fourth Proportional to 128,639.64, 192,978.12 and 39,900.30

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Solution

The fourth proportional to 128,639.64, 192,978.12 and 39,900.30 is: 59,856.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,639.64 : 192,978.12 = 39,900.30 : x
  2. Step 2: Convert to fraction form
    128,639.64/192,978.12 = 39,900.30/x
  3. Step 3: Cross multiply
    128,639.64x = 192,978.12 × 39,900.30
  4. Step 4: Simplify right side
    128,639.64x = 7,699,884,881.44
  5. Step 5: Solve for x
    x = 7,699,884,881.44/128,639.64
  6. Step 6: Final answer
    x = 59,856.24

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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.