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Finding the Fourth Proportional to 426,487.80, 640,682.10 and 356,503.80

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Solution

The fourth proportional to 426,487.80, 640,682.10 and 356,503.80 is: 535,550.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,487.80 : 640,682.10 = 356,503.80 : x
  2. Step 2: Convert to fraction form
    426,487.80/640,682.10 = 356,503.80/x
  3. Step 3: Cross multiply
    426,487.80x = 640,682.10 × 356,503.80
  4. Step 4: Simplify right side
    426,487.80x = 228,405,603,241.98
  5. Step 5: Solve for x
    x = 228,405,603,241.98/426,487.80
  6. Step 6: Final answer
    x = 535,550.15

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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.