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Finding the Fourth Proportional to 339,918.60, 509,877.90 and 318,923.40

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Solution

The fourth proportional to 339,918.60, 509,877.90 and 318,923.40 is: 478,385.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,918.60 : 509,877.90 = 318,923.40 : x
  2. Step 2: Convert to fraction form
    339,918.60/509,877.90 = 318,923.40/x
  3. Step 3: Cross multiply
    339,918.60x = 509,877.90 × 318,923.40
  4. Step 4: Simplify right side
    339,918.60x = 162,611,993,452.86
  5. Step 5: Solve for x
    x = 162,611,993,452.86/339,918.60
  6. Step 6: Final answer
    x = 478,385.10

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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.