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Finding the Fourth Proportional to 391,328.20, 587,705.10 and 342,339.40

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Solution

The fourth proportional to 391,328.20, 587,705.10 and 342,339.40 is: 514,132.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,328.20 : 587,705.10 = 342,339.40 : x
  2. Step 2: Convert to fraction form
    391,328.20/587,705.10 = 342,339.40/x
  3. Step 3: Cross multiply
    391,328.20x = 587,705.10 × 342,339.40
  4. Step 4: Simplify right side
    391,328.20x = 201,194,611,310.94
  5. Step 5: Solve for x
    x = 201,194,611,310.94/391,328.20
  6. Step 6: Final answer
    x = 514,132.67

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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.