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Finding the Fourth Proportional to 208,605.20, 312,907.80 and 125,661.20

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Solution

The fourth proportional to 208,605.20, 312,907.80 and 125,661.20 is: 188,491.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,605.20 : 312,907.80 = 125,661.20 : x
  2. Step 2: Convert to fraction form
    208,605.20/312,907.80 = 125,661.20/x
  3. Step 3: Cross multiply
    208,605.20x = 312,907.80 × 125,661.20
  4. Step 4: Simplify right side
    208,605.20x = 39,320,369,637.36
  5. Step 5: Solve for x
    x = 39,320,369,637.36/208,605.20
  6. Step 6: Final answer
    x = 188,491.80

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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.