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Finding the Fourth Proportional to 410,605.20, 615,907.80 and 391,359.60

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Solution

The fourth proportional to 410,605.20, 615,907.80 and 391,359.60 is: 587,039.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    410,605.20 : 615,907.80 = 391,359.60 : x
  2. Step 2: Convert to fraction form
    410,605.20/615,907.80 = 391,359.60/x
  3. Step 3: Cross multiply
    410,605.20x = 615,907.80 × 391,359.60
  4. Step 4: Simplify right side
    410,605.20x = 241,041,430,244.88
  5. Step 5: Solve for x
    x = 241,041,430,244.88/410,605.20
  6. Step 6: Final answer
    x = 587,039.40

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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.