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Finding the Fourth Proportional to 321,921.60, 482,968.80 and 287,102.40

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Solution

The fourth proportional to 321,921.60, 482,968.80 and 287,102.40 is: 430,730.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,921.60 : 482,968.80 = 287,102.40 : x
  2. Step 2: Convert to fraction form
    321,921.60/482,968.80 = 287,102.40/x
  3. Step 3: Cross multiply
    321,921.60x = 482,968.80 × 287,102.40
  4. Step 4: Simplify right side
    321,921.60x = 138,661,501,605.12
  5. Step 5: Solve for x
    x = 138,661,501,605.12/321,921.60
  6. Step 6: Final answer
    x = 430,730.65

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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.