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Finding the Fourth Proportional to 422,710.77, 583,428.93 and 388,665.39

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Solution

The fourth proportional to 422,710.77, 583,428.93 and 388,665.39 is: 536,439.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    422,710.77 : 583,428.93 = 388,665.39 : x
  2. Step 2: Convert to fraction form
    422,710.77/583,428.93 = 388,665.39/x
  3. Step 3: Cross multiply
    422,710.77x = 583,428.93 × 388,665.39
  4. Step 4: Simplify right side
    422,710.77x = 226,758,632,615.73
  5. Step 5: Solve for x
    x = 226,758,632,615.73/422,710.77
  6. Step 6: Final answer
    x = 536,439.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.