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Finding the Fourth Proportional to 398,636.80, 597,955.20 and 272,665.60

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Solution

The fourth proportional to 398,636.80, 597,955.20 and 272,665.60 is: 408,998.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,636.80 : 597,955.20 = 272,665.60 : x
  2. Step 2: Convert to fraction form
    398,636.80/597,955.20 = 272,665.60/x
  3. Step 3: Cross multiply
    398,636.80x = 597,955.20 × 272,665.60
  4. Step 4: Simplify right side
    398,636.80x = 163,041,813,381.12
  5. Step 5: Solve for x
    x = 163,041,813,381.12/398,636.80
  6. Step 6: Final answer
    x = 408,998.40

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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.