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Finding the Fourth Proportional to 399,230.18, 550,938.90 and 255,990.80

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Solution

The fourth proportional to 399,230.18, 550,938.90 and 255,990.80 is: 353,268.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,230.18 : 550,938.90 = 255,990.80 : x
  2. Step 2: Convert to fraction form
    399,230.18/550,938.90 = 255,990.80/x
  3. Step 3: Cross multiply
    399,230.18x = 550,938.90 × 255,990.80
  4. Step 4: Simplify right side
    399,230.18x = 141,035,287,007.43
  5. Step 5: Solve for x
    x = 141,035,287,007.43/399,230.18
  6. Step 6: Final answer
    x = 353,268.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.