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Finding the Fourth Proportional to 391,536.80, 587,305.20 and 343,325.60

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Solution

The fourth proportional to 391,536.80, 587,305.20 and 343,325.60 is: 514,988.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,536.80 : 587,305.20 = 343,325.60 : x
  2. Step 2: Convert to fraction form
    391,536.80/587,305.20 = 343,325.60/x
  3. Step 3: Cross multiply
    391,536.80x = 587,305.20 × 343,325.60
  4. Step 4: Simplify right side
    391,536.80x = 201,636,910,173.12
  5. Step 5: Solve for x
    x = 201,636,910,173.12/391,536.80
  6. Step 6: Final answer
    x = 514,988.40

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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.