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Finding the Fourth Proportional to 391,300.20, 587,663.10 and 342,311.40

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Solution

The fourth proportional to 391,300.20, 587,663.10 and 342,311.40 is: 514,090.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,300.20 : 587,663.10 = 342,311.40 : x
  2. Step 2: Convert to fraction form
    391,300.20/587,663.10 = 342,311.40/x
  3. Step 3: Cross multiply
    391,300.20x = 587,663.10 × 342,311.40
  4. Step 4: Simplify right side
    391,300.20x = 201,163,778,489.34
  5. Step 5: Solve for x
    x = 201,163,778,489.34/391,300.20
  6. Step 6: Final answer
    x = 514,090.66

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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.