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Finding the Fourth Proportional to 399,639.80, 599,459.70 and 366,980.60

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Solution

The fourth proportional to 399,639.80, 599,459.70 and 366,980.60 is: 550,470.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,639.80 : 599,459.70 = 366,980.60 : x
  2. Step 2: Convert to fraction form
    399,639.80/599,459.70 = 366,980.60/x
  3. Step 3: Cross multiply
    399,639.80x = 599,459.70 × 366,980.60
  4. Step 4: Simplify right side
    399,639.80x = 219,990,080,381.82
  5. Step 5: Solve for x
    x = 219,990,080,381.82/399,639.80
  6. Step 6: Final answer
    x = 550,470.90

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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.