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Finding the Fourth Proportional to 638,830.40, 957,439.20 and 323,374.40

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Solution

The fourth proportional to 638,830.40, 957,439.20 and 323,374.40 is: 484,653.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,830.40 : 957,439.20 = 323,374.40 : x
  2. Step 2: Convert to fraction form
    638,830.40/957,439.20 = 323,374.40/x
  3. Step 3: Cross multiply
    638,830.40x = 957,439.20 × 323,374.40
  4. Step 4: Simplify right side
    638,830.40x = 309,611,326,836.48
  5. Step 5: Solve for x
    x = 309,611,326,836.48/638,830.40
  6. Step 6: Final answer
    x = 484,653.40

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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.