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Finding the Fourth Proportional to 388,786.79, 583,092.70 and 139,468.79

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Solution

The fourth proportional to 388,786.79, 583,092.70 and 139,468.79 is: 209,171.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    388,786.79 : 583,092.70 = 139,468.79 : x
  2. Step 2: Convert to fraction form
    388,786.79/583,092.70 = 139,468.79/x
  3. Step 3: Cross multiply
    388,786.79x = 583,092.70 × 139,468.79
  4. Step 4: Simplify right side
    388,786.79x = 81,323,231,548.25
  5. Step 5: Solve for x
    x = 81,323,231,548.25/388,786.79
  6. Step 6: Final answer
    x = 209,171.80

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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.