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Finding the Fourth Proportional to 339,915.60, 509,873.40 and 318,920.40

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Solution

The fourth proportional to 339,915.60, 509,873.40 and 318,920.40 is: 478,380.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,915.60 : 509,873.40 = 318,920.40 : x
  2. Step 2: Convert to fraction form
    339,915.60/509,873.40 = 318,920.40/x
  3. Step 3: Cross multiply
    339,915.60x = 509,873.40 × 318,920.40
  4. Step 4: Simplify right side
    339,915.60x = 162,609,028,677.36
  5. Step 5: Solve for x
    x = 162,609,028,677.36/339,915.60
  6. Step 6: Final answer
    x = 478,380.60

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1.5x scale

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.