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Finding the Fourth Proportional to 387,764.60, 581,339.70 and 212,660.60

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Solution

The fourth proportional to 387,764.60, 581,339.70 and 212,660.60 is: 318,822.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,764.60 : 581,339.70 = 212,660.60 : x
  2. Step 2: Convert to fraction form
    387,764.60/581,339.70 = 212,660.60/x
  3. Step 3: Cross multiply
    387,764.60x = 581,339.70 × 212,660.60
  4. Step 4: Simplify right side
    387,764.60x = 123,628,049,405.82
  5. Step 5: Solve for x
    x = 123,628,049,405.82/387,764.60
  6. Step 6: Final answer
    x = 318,822.42

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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.