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Finding the Fourth Proportional to 815,728.40, 1,223,592.60 and 343,336.40

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Solution

The fourth proportional to 815,728.40, 1,223,592.60 and 343,336.40 is: 515,004.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,728.40 : 1,223,592.60 = 343,336.40 : x
  2. Step 2: Convert to fraction form
    815,728.40/1,223,592.60 = 343,336.40/x
  3. Step 3: Cross multiply
    815,728.40x = 1,223,592.60 × 343,336.40
  4. Step 4: Simplify right side
    815,728.40x = 420,103,878,350.64
  5. Step 5: Solve for x
    x = 420,103,878,350.64/815,728.40
  6. Step 6: Final answer
    x = 515,004.60

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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.