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Finding the Fourth Proportional to 492,340.39, 679,431.59 and 311,132.86

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Solution

The fourth proportional to 492,340.39, 679,431.59 and 311,132.86 is: 429,364.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    492,340.39 : 679,431.59 = 311,132.86 : x
  2. Step 2: Convert to fraction form
    492,340.39/679,431.59 = 311,132.86/x
  3. Step 3: Cross multiply
    492,340.39x = 679,431.59 × 311,132.86
  4. Step 4: Simplify right side
    492,340.39x = 211,393,493,771.05
  5. Step 5: Solve for x
    x = 211,393,493,771.05/492,340.39
  6. Step 6: Final answer
    x = 429,364.52

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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.