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Finding the Fourth Proportional to 128,491.14, 192,728.50 and 39,737.21

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Solution

The fourth proportional to 128,491.14, 192,728.50 and 39,737.21 is: 59,603.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,491.14 : 192,728.50 = 39,737.21 : x
  2. Step 2: Convert to fraction form
    128,491.14/192,728.50 = 39,737.21/x
  3. Step 3: Cross multiply
    128,491.14x = 192,728.50 × 39,737.21
  4. Step 4: Simplify right side
    128,491.14x = 7,658,492,678.80
  5. Step 5: Solve for x
    x = 7,658,492,678.80/128,491.14
  6. Step 6: Final answer
    x = 59,603.28

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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.