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Finding the Fourth Proportional to 128,537.80, 192,806.70 and 125,913.40

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Solution

The fourth proportional to 128,537.80, 192,806.70 and 125,913.40 is: 188,870.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,537.80 : 192,806.70 = 125,913.40 : x
  2. Step 2: Convert to fraction form
    128,537.80/192,806.70 = 125,913.40/x
  3. Step 3: Cross multiply
    128,537.80x = 192,806.70 × 125,913.40
  4. Step 4: Simplify right side
    128,537.80x = 24,276,947,139.78
  5. Step 5: Solve for x
    x = 24,276,947,139.78/128,537.80
  6. Step 6: Final answer
    x = 188,870.10

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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.