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Finding the Fourth Proportional to 391,998.80, 587,998.20 and 312,683.60

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Solution

The fourth proportional to 391,998.80, 587,998.20 and 312,683.60 is: 469,025.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,998.80 : 587,998.20 = 312,683.60 : x
  2. Step 2: Convert to fraction form
    391,998.80/587,998.20 = 312,683.60/x
  3. Step 3: Cross multiply
    391,998.80x = 587,998.20 × 312,683.60
  4. Step 4: Simplify right side
    391,998.80x = 183,857,393,969.52
  5. Step 5: Solve for x
    x = 183,857,393,969.52/391,998.80
  6. Step 6: Final answer
    x = 469,025.40

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1.5x scale

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.