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Finding the Fourth Proportional to 128,616.66, 192,953.68 and 39,870.90

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Solution

The fourth proportional to 128,616.66, 192,953.68 and 39,870.90 is: 59,815.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,616.66 : 192,953.68 = 39,870.90 : x
  2. Step 2: Convert to fraction form
    128,616.66/192,953.68 = 39,870.90/x
  3. Step 3: Cross multiply
    128,616.66x = 192,953.68 × 39,870.90
  4. Step 4: Simplify right side
    128,616.66x = 7,693,236,780.23
  5. Step 5: Solve for x
    x = 7,693,236,780.23/128,616.66
  6. Step 6: Final answer
    x = 59,815.24

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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.