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Finding the Fourth Proportional to 128,602.62, 192,903.95 and 53,681.90

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Solution

The fourth proportional to 128,602.62, 192,903.95 and 53,681.90 is: 80,522.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,602.62 : 192,903.95 = 53,681.90 : x
  2. Step 2: Convert to fraction form
    128,602.62/192,903.95 = 53,681.90/x
  3. Step 3: Cross multiply
    128,602.62x = 192,903.95 × 53,681.90
  4. Step 4: Simplify right side
    128,602.62x = 10,355,450,553.51
  5. Step 5: Solve for x
    x = 10,355,450,553.51/128,602.62
  6. Step 6: Final answer
    x = 80,522.86

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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.