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Finding the Fourth Proportional to 409,699.20, 615,009.60 and 316,617.60

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Solution

The fourth proportional to 409,699.20, 615,009.60 and 316,617.60 is: 475,282.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,699.20 : 615,009.60 = 316,617.60 : x
  2. Step 2: Convert to fraction form
    409,699.20/615,009.60 = 316,617.60/x
  3. Step 3: Cross multiply
    409,699.20x = 615,009.60 × 316,617.60
  4. Step 4: Simplify right side
    409,699.20x = 194,722,863,528.96
  5. Step 5: Solve for x
    x = 194,722,863,528.96/409,699.20
  6. Step 6: Final answer
    x = 475,282.51

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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.