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Finding the Fourth Proportional to 409,701.20, 615,012.60 and 316,619.60

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Solution

The fourth proportional to 409,701.20, 615,012.60 and 316,619.60 is: 475,285.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,701.20 : 615,012.60 = 316,619.60 : x
  2. Step 2: Convert to fraction form
    409,701.20/615,012.60 = 316,619.60/x
  3. Step 3: Cross multiply
    409,701.20x = 615,012.60 × 316,619.60
  4. Step 4: Simplify right side
    409,701.20x = 194,725,043,406.96
  5. Step 5: Solve for x
    x = 194,725,043,406.96/409,701.20
  6. Step 6: Final answer
    x = 475,285.51

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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.