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Finding the Fourth Proportional to 339,930.60, 509,895.90 and 318,935.40

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Solution

The fourth proportional to 339,930.60, 509,895.90 and 318,935.40 is: 478,403.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,930.60 : 509,895.90 = 318,935.40 : x
  2. Step 2: Convert to fraction form
    339,930.60/509,895.90 = 318,935.40/x
  3. Step 3: Cross multiply
    339,930.60x = 509,895.90 × 318,935.40
  4. Step 4: Simplify right side
    339,930.60x = 162,623,852,824.86
  5. Step 5: Solve for x
    x = 162,623,852,824.86/339,930.60
  6. Step 6: Final answer
    x = 478,403.10

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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.