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Finding the Fourth Proportional to 391,515.80, 587,273.70 and 343,304.60

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Solution

The fourth proportional to 391,515.80, 587,273.70 and 343,304.60 is: 514,956.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,515.80 : 587,273.70 = 343,304.60 : x
  2. Step 2: Convert to fraction form
    391,515.80/587,273.70 = 343,304.60/x
  3. Step 3: Cross multiply
    391,515.80x = 587,273.70 × 343,304.60
  4. Step 4: Simplify right side
    391,515.80x = 201,613,762,669.02
  5. Step 5: Solve for x
    x = 201,613,762,669.02/391,515.80
  6. Step 6: Final answer
    x = 514,956.90

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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.